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On Tue, 27 Jul 2004 02:58:19 +0000, Jason wrote:
A while back i asked about if it is okay to put fibreglass below the waterline of my 28 foot mahogany lapstraked carver mariner. Overwhelmingly the response was NO. heres my next question, Would just using epoxy to coat all wood surfaces of the hull be okay? or does anyone see anything wrong with it? i need the quickest, easiest way to make this boat waterproof so i can get a month out of it this year at least. it has already been sanded down, just waiting for my next move. any help is appreciated. thanks, -Jason I wouldn't normally think of epoxy as a waterproofing material, but I don't know what kind of boat you have. Here is a quote from _The Gougeon Brothers on Boat Construction_ (fourth edition) "Most available plans for traditional small craft were drawn many years before the development of modern resins. They rely on traditional building techniques ... This sort of construction is not compatible with our methods and, unfortunately, any attempt to blend old and new will probably result in an unsuccessful hybrid." (p7) The Gougeon brothers are the guys behind West System epoxy products. So I would advise you to seal the boat in the same fashion (more or less) in which it was designed to be sealed. I do have a little experience with the aesthetics of applying epoxy to wood. By itself, epoxy is a terrible varnish substitute. It looks great at first, and it is relatively easy to get a nice glossy finish, but it begins to go milky. It will do this very rapidly (in a few days) if it is exposed to direct sunlight. Eventually, it will be kind of yellow and almost opaque. What you can do, however, is apply a few coats of epoxy first to get rapid buildup and a nearly perfect finish with little or no sanding, then apply a standard marine varnish afterwards. (You have to wet sand the epoxy with very fine sandpaper prior to applying the varnish). I'm not sure how this holds up over the course of decades, but it holds up pretty well for interior jobs over the course of several years. Practice on a piece of plywood before you do it on a piece you care about. Also, some varnishes may attack the cured epoxy, so be sure to test the exact combination before using it. HTH --Mac |
#2
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Jumping in late in the conversation here, so forgive me if I'm off track. I did manage to build a traditionally constructed boat (see http://www.reelboats.com ) with epoxy encapsulation one time, but not sure I'd recommend it. Especially if the boat you are working on will not be completely disassembled. In my case, I had to cut, fit, and finish each and every component and then epoxy encapsulate them individually, then assembled the boat with the sealed pieces. In some parts, such as putting the bottom on, I still had to resort to standard fasteners and good adhesive/caulk (3M 5200, Sikaflex 241) as appropriate. If I were to do a traditionally constructed boat again, I'd stick to the original way of sealing ...else it costs you about 3X to 4X the time and it's likely that you still can't get it all right. Note that since epoxy is 99.99% waterproof that any moisture in that gets in the wood will migrate through the wood but run into the epoxy 'barrier' from the inside. Because of surface states (check your chemistry book), the water or moisture tends to stay at that boundary and can lead to rot. It's better to either completely encapsulate and then keep it that way -OR- say to heck with epoxy and use the same 'sealing' technique (primer, paint, caulks etc) everywhere. Given the above caveats, if you are only trying to get one month out of it, then I guess you can pretty much do what you want ...waterproof with a good coat of Grey Poupon Dijon if you want (grinz). On a more serious note, you can expect that each coat of epoxy is equivalent to about 3 coats of varnish for thickness. If encapsulating on a bright finished boat as described above, rather than coating the boat with 10- 12 coats of varnish, you can get away with about 3 coats of epoxy (do not do less than that) and finish with 4 coats of a good quality UV inhibitive varnish such as Epifanes or Z-Spar Captains. 4 coats of varnish is a bit on the thin side but will get you through the first year. You should follow with coating more varnish on each year for the first 2 to 4 years before you relax. After that, you can expect 4 to 6 years (depending on sun exposure) between recoatings ...much better than the annual sanding and coating that varnish-only boats require. Brian D "Mac" wrote in message news On Tue, 27 Jul 2004 02:58:19 +0000, Jason wrote: A while back i asked about if it is okay to put fibreglass below the waterline of my 28 foot mahogany lapstraked carver mariner. Overwhelmingly the response was NO. heres my next question, Would just using epoxy to coat all wood surfaces of the hull be okay? or does anyone see anything wrong with it? i need the quickest, easiest way to make this boat waterproof so i can get a month out of it this year at least. it has already been sanded down, just waiting for my next move. any help is appreciated. thanks, -Jason I wouldn't normally think of epoxy as a waterproofing material, but I don't know what kind of boat you have. Here is a quote from _The Gougeon Brothers on Boat Construction_ (fourth edition) "Most available plans for traditional small craft were drawn many years before the development of modern resins. They rely on traditional building techniques ... This sort of construction is not compatible with our methods and, unfortunately, any attempt to blend old and new will probably result in an unsuccessful hybrid." (p7) The Gougeon brothers are the guys behind West System epoxy products. So I would advise you to seal the boat in the same fashion (more or less) in which it was designed to be sealed. I do have a little experience with the aesthetics of applying epoxy to wood. By itself, epoxy is a terrible varnish substitute. It looks great at first, and it is relatively easy to get a nice glossy finish, but it begins to go milky. It will do this very rapidly (in a few days) if it is exposed to direct sunlight. Eventually, it will be kind of yellow and almost opaque. What you can do, however, is apply a few coats of epoxy first to get rapid buildup and a nearly perfect finish with little or no sanding, then apply a standard marine varnish afterwards. (You have to wet sand the epoxy with very fine sandpaper prior to applying the varnish). I'm not sure how this holds up over the course of decades, but it holds up pretty well for interior jobs over the course of several years. Practice on a piece of plywood before you do it on a piece you care about. Also, some varnishes may attack the cured epoxy, so be sure to test the exact combination before using it. HTH --Mac |
#3
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I wonder if anyone of you have used Nyalic yet on wood instead of varnish..
It is UV proof cystal clear waterproof, nylonic coating. It is expensive. Someday I will buy some. "Brian D" wrote in message news:OWhVc.157060$8_6.56861@attbi_s04... Jumping in late in the conversation here, so forgive me if I'm off track. I did manage to build a traditionally constructed boat (see http://www.reelboats.com ) with epoxy encapsulation one time, but not sure I'd recommend it. Especially if the boat you are working on will not be completely disassembled. In my case, I had to cut, fit, and finish each and every component and then epoxy encapsulate them individually, then assembled the boat with the sealed pieces. In some parts, such as putting the bottom on, I still had to resort to standard fasteners and good adhesive/caulk (3M 5200, Sikaflex 241) as appropriate. If I were to do a traditionally constructed boat again, I'd stick to the original way of sealing ...else it costs you about 3X to 4X the time and it's likely that you still can't get it all right. Note that since epoxy is 99.99% waterproof that any moisture in that gets in the wood will migrate through the wood but run into the epoxy 'barrier' from the inside. Because of surface states (check your chemistry book), the water or moisture tends to stay at that boundary and can lead to rot. It's better to either completely encapsulate and then keep it that way -OR- say to heck with epoxy and use the same 'sealing' technique (primer, paint, caulks etc) everywhere. Given the above caveats, if you are only trying to get one month out of it, then I guess you can pretty much do what you want ...waterproof with a good coat of Grey Poupon Dijon if you want (grinz). On a more serious note, you can expect that each coat of epoxy is equivalent to about 3 coats of varnish for thickness. If encapsulating on a bright finished boat as described above, rather than coating the boat with 10- 12 coats of varnish, you can get away with about 3 coats of epoxy (do not do less than that) and finish with 4 coats of a good quality UV inhibitive varnish such as Epifanes or Z-Spar Captains. 4 coats of varnish is a bit on the thin side but will get you through the first year. You should follow with coating more varnish on each year for the first 2 to 4 years before you relax. After that, you can expect 4 to 6 years (depending on sun exposure) between recoatings ...much better than the annual sanding and coating that varnish-only boats require. Brian D "Mac" wrote in message news On Tue, 27 Jul 2004 02:58:19 +0000, Jason wrote: A while back i asked about if it is okay to put fibreglass below the waterline of my 28 foot mahogany lapstraked carver mariner. Overwhelmingly the response was NO. heres my next question, Would just using epoxy to coat all wood surfaces of the hull be okay? or does anyone see anything wrong with it? i need the quickest, easiest way to make this boat waterproof so i can get a month out of it this year at least. it has already been sanded down, just waiting for my next move. any help is appreciated. thanks, -Jason I wouldn't normally think of epoxy as a waterproofing material, but I don't know what kind of boat you have. Here is a quote from _The Gougeon Brothers on Boat Construction_ (fourth edition) "Most available plans for traditional small craft were drawn many years before the development of modern resins. They rely on traditional building techniques ... This sort of construction is not compatible with our methods and, unfortunately, any attempt to blend old and new will probably result in an unsuccessful hybrid." (p7) The Gougeon brothers are the guys behind West System epoxy products. So I would advise you to seal the boat in the same fashion (more or less) in which it was designed to be sealed. I do have a little experience with the aesthetics of applying epoxy to wood. By itself, epoxy is a terrible varnish substitute. It looks great at first, and it is relatively easy to get a nice glossy finish, but it begins to go milky. It will do this very rapidly (in a few days) if it is exposed to direct sunlight. Eventually, it will be kind of yellow and almost opaque. What you can do, however, is apply a few coats of epoxy first to get rapid buildup and a nearly perfect finish with little or no sanding, then apply a standard marine varnish afterwards. (You have to wet sand the epoxy with very fine sandpaper prior to applying the varnish). I'm not sure how this holds up over the course of decades, but it holds up pretty well for interior jobs over the course of several years. Practice on a piece of plywood before you do it on a piece you care about. Also, some varnishes may attack the cured epoxy, so be sure to test the exact combination before using it. HTH --Mac |
#4
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One thing nice about marine varnish is that it can be stripped. Some of the good coatings out there that would replace varnish are unstrippable plastics ....is this Nyalic stuff strippable? What's it like for repair later on? Brian D "scott downey" wrote in message ... I wonder if anyone of you have used Nyalic yet on wood instead of varnish.. It is UV proof cystal clear waterproof, nylonic coating. It is expensive. Someday I will buy some. "Brian D" wrote in message news:OWhVc.157060$8_6.56861@attbi_s04... Jumping in late in the conversation here, so forgive me if I'm off track. I did manage to build a traditionally constructed boat (see http://www.reelboats.com ) with epoxy encapsulation one time, but not sure I'd recommend it. Especially if the boat you are working on will not be completely disassembled. In my case, I had to cut, fit, and finish each and every component and then epoxy encapsulate them individually, then assembled the boat with the sealed pieces. In some parts, such as putting the bottom on, I still had to resort to standard fasteners and good adhesive/caulk (3M 5200, Sikaflex 241) as appropriate. If I were to do a traditionally constructed boat again, I'd stick to the original way of sealing ...else it costs you about 3X to 4X the time and it's likely that you still can't get it all right. Note that since epoxy is 99.99% waterproof that any moisture in that gets in the wood will migrate through the wood but run into the epoxy 'barrier' from the inside. Because of surface states (check your chemistry book), the water or moisture tends to stay at that boundary and can lead to rot. It's better to either completely encapsulate and then keep it that way -OR- say to heck with epoxy and use the same 'sealing' technique (primer, paint, caulks etc) everywhere. Given the above caveats, if you are only trying to get one month out of it, then I guess you can pretty much do what you want ...waterproof with a good coat of Grey Poupon Dijon if you want (grinz). On a more serious note, you can expect that each coat of epoxy is equivalent to about 3 coats of varnish for thickness. If encapsulating on a bright finished boat as described above, rather than coating the boat with 10- 12 coats of varnish, you can get away with about 3 coats of epoxy (do not do less than that) and finish with 4 coats of a good quality UV inhibitive varnish such as Epifanes or Z-Spar Captains. 4 coats of varnish is a bit on the thin side but will get you through the first year. You should follow with coating more varnish on each year for the first 2 to 4 years before you relax. After that, you can expect 4 to 6 years (depending on sun exposure) between recoatings ....much better than the annual sanding and coating that varnish-only boats require. Brian D "Mac" wrote in message news On Tue, 27 Jul 2004 02:58:19 +0000, Jason wrote: A while back i asked about if it is okay to put fibreglass below the waterline of my 28 foot mahogany lapstraked carver mariner. Overwhelmingly the response was NO. heres my next question, Would just using epoxy to coat all wood surfaces of the hull be okay? or does anyone see anything wrong with it? i need the quickest, easiest way to make this boat waterproof so i can get a month out of it this year at least. it has already been sanded down, just waiting for my next move. any help is appreciated. thanks, -Jason I wouldn't normally think of epoxy as a waterproofing material, but I don't know what kind of boat you have. Here is a quote from _The Gougeon Brothers on Boat Construction_ (fourth edition) "Most available plans for traditional small craft were drawn many years before the development of modern resins. They rely on traditional building techniques ... This sort of construction is not compatible with our methods and, unfortunately, any attempt to blend old and new will probably result in an unsuccessful hybrid." (p7) The Gougeon brothers are the guys behind West System epoxy products. So I would advise you to seal the boat in the same fashion (more or less) in which it was designed to be sealed. I do have a little experience with the aesthetics of applying epoxy to wood. By itself, epoxy is a terrible varnish substitute. It looks great at first, and it is relatively easy to get a nice glossy finish, but it begins to go milky. It will do this very rapidly (in a few days) if it is exposed to direct sunlight. Eventually, it will be kind of yellow and almost opaque. What you can do, however, is apply a few coats of epoxy first to get rapid buildup and a nearly perfect finish with little or no sanding, then apply a standard marine varnish afterwards. (You have to wet sand the epoxy with very fine sandpaper prior to applying the varnish). I'm not sure how this holds up over the course of decades, but it holds up pretty well for interior jobs over the course of several years. Practice on a piece of plywood before you do it on a piece you care about. Also, some varnishes may attack the cured epoxy, so be sure to test the exact combination before using it. HTH --Mac |
#5
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It does have a solvent and new coats melt into the old.
"Brian D" wrote in message news:89K_c.135270$mD.91951@attbi_s02... One thing nice about marine varnish is that it can be stripped. Some of the good coatings out there that would replace varnish are unstrippable plastics ...is this Nyalic stuff strippable? What's it like for repair later on? Brian D "scott downey" wrote in message ... I wonder if anyone of you have used Nyalic yet on wood instead of varnish.. It is UV proof cystal clear waterproof, nylonic coating. It is expensive. Someday I will buy some. "Brian D" wrote in message news:OWhVc.157060$8_6.56861@attbi_s04... Jumping in late in the conversation here, so forgive me if I'm off track. I did manage to build a traditionally constructed boat (see http://www.reelboats.com ) with epoxy encapsulation one time, but not sure I'd recommend it. Especially if the boat you are working on will not be completely disassembled. In my case, I had to cut, fit, and finish each and every component and then epoxy encapsulate them individually, then assembled the boat with the sealed pieces. In some parts, such as putting the bottom on, I still had to resort to standard fasteners and good adhesive/caulk (3M 5200, Sikaflex 241) as appropriate. If I were to do a traditionally constructed boat again, I'd stick to the original way of sealing ....else it costs you about 3X to 4X the time and it's likely that you still can't get it all right. Note that since epoxy is 99.99% waterproof that any moisture in that gets in the wood will migrate through the wood but run into the epoxy 'barrier' from the inside. Because of surface states (check your chemistry book), the water or moisture tends to stay at that boundary and can lead to rot. It's better to either completely encapsulate and then keep it that way -OR- say to heck with epoxy and use the same 'sealing' technique (primer, paint, caulks etc) everywhere. Given the above caveats, if you are only trying to get one month out of it, then I guess you can pretty much do what you want ...waterproof with a good coat of Grey Poupon Dijon if you want (grinz). On a more serious note, you can expect that each coat of epoxy is equivalent to about 3 coats of varnish for thickness. If encapsulating on a bright finished boat as described above, rather than coating the boat with 10- 12 coats of varnish, you can get away with about 3 coats of epoxy (do not do less than that) and finish with 4 coats of a good quality UV inhibitive varnish such as Epifanes or Z-Spar Captains. 4 coats of varnish is a bit on the thin side but will get you through the first year. You should follow with coating more varnish on each year for the first 2 to 4 years before you relax. After that, you can expect 4 to 6 years (depending on sun exposure) between recoatings ...much better than the annual sanding and coating that varnish-only boats require. Brian D "Mac" wrote in message news On Tue, 27 Jul 2004 02:58:19 +0000, Jason wrote: A while back i asked about if it is okay to put fibreglass below the waterline of my 28 foot mahogany lapstraked carver mariner. Overwhelmingly the response was NO. heres my next question, Would just using epoxy to coat all wood surfaces of the hull be okay? or does anyone see anything wrong with it? i need the quickest, easiest way to make this boat waterproof so i can get a month out of it this year at least. it has already been sanded down, just waiting for my next move. any help is appreciated. thanks, -Jason I wouldn't normally think of epoxy as a waterproofing material, but I don't know what kind of boat you have. Here is a quote from _The Gougeon Brothers on Boat Construction_ (fourth edition) "Most available plans for traditional small craft were drawn many years before the development of modern resins. They rely on traditional building techniques ... This sort of construction is not compatible with our methods and, unfortunately, any attempt to blend old and new will probably result in an unsuccessful hybrid." (p7) The Gougeon brothers are the guys behind West System epoxy products. So I would advise you to seal the boat in the same fashion (more or less) in which it was designed to be sealed. I do have a little experience with the aesthetics of applying epoxy to wood. By itself, epoxy is a terrible varnish substitute. It looks great at first, and it is relatively easy to get a nice glossy finish, but it begins to go milky. It will do this very rapidly (in a few days) if it is exposed to direct sunlight. Eventually, it will be kind of yellow and almost opaque. What you can do, however, is apply a few coats of epoxy first to get rapid buildup and a nearly perfect finish with little or no sanding, then apply a standard marine varnish afterwards. (You have to wet sand the epoxy with very fine sandpaper prior to applying the varnish). I'm not sure how this holds up over the course of decades, but it holds up pretty well for interior jobs over the course of several years. Practice on a piece of plywood before you do it on a piece you care about. Also, some varnishes may attack the cured epoxy, so be sure to test the exact combination before using it. HTH --Mac |
#6
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Ten years ago we used system 3 epoxy over stained mahagony on the stern
of a strip built boat. The system 3 person was dubious, more about the stain than the mahogony. We coated the epoxy several coats of Zspar varnish. The epoxy has remained clear and pristine since then. The glas and epoxy elsewhere on the boat laid over sanded non-stained cedar has lifted in spots, but the boat gets lots of flex and abuse in those portions. As the hull is intact I sanded the areas flat and applied a couple more coats of epoxy to the marred surface areas. The boat is in the sun a lot and is rowed hard in races...great stuff this epoxy. Jim Raney scott downey wrote: I wonder if anyone of you have used Nyalic yet on wood instead of varnish.. It is UV proof cystal clear waterproof, nylonic coating. It is expensive. Someday I will buy some. "Brian D" wrote in message news:OWhVc.157060$8_6.56861@attbi_s04... Jumping in late in the conversation here, so forgive me if I'm off track. I did manage to build a traditionally constructed boat (see http://www.reelboats.com ) with epoxy encapsulation one time, but not sure I'd recommend it. Especially if the boat you are working on will not be completely disassembled. In my case, I had to cut, fit, and finish each and every component and then epoxy encapsulate them individually, then assembled the boat with the sealed pieces. In some parts, such as putting the bottom on, I still had to resort to standard fasteners and good adhesive/caulk (3M 5200, Sikaflex 241) as appropriate. If I were to do a traditionally constructed boat again, I'd stick to the original way of sealing ...else it costs you about 3X to 4X the time and it's likely that you still can't get it all right. Note that since epoxy is 99.99% waterproof that any moisture in that gets in the wood will migrate through the wood but run into the epoxy 'barrier' from the inside. Because of surface states (check your chemistry book), the water or moisture tends to stay at that boundary and can lead to rot. It's better to either completely encapsulate and then keep it that way -OR- say to heck with epoxy and use the same 'sealing' technique (primer, paint, caulks etc) everywhere. Given the above caveats, if you are only trying to get one month out of it, then I guess you can pretty much do what you want ...waterproof with a good coat of Grey Poupon Dijon if you want (grinz). On a more serious note, you can expect that each coat of epoxy is equivalent to about 3 coats of varnish for thickness. If encapsulating on a bright finished boat as described above, rather than coating the boat with 10- 12 coats of varnish, you can get away with about 3 coats of epoxy (do not do less than that) and finish with 4 coats of a good quality UV inhibitive varnish such as Epifanes or Z-Spar Captains. 4 coats of varnish is a bit on the thin side but will get you through the first year. You should follow with coating more varnish on each year for the first 2 to 4 years before you relax. After that, you can expect 4 to 6 years (depending on sun exposure) between recoatings ...much better than the annual sanding and coating that varnish-only boats require. Brian D "Mac" wrote in message news On Tue, 27 Jul 2004 02:58:19 +0000, Jason wrote: A while back i asked about if it is okay to put fibreglass below the waterline of my 28 foot mahogany lapstraked carver mariner. Overwhelmingly the response was NO. heres my next question, Would just using epoxy to coat all wood surfaces of the hull be okay? or does anyone see anything wrong with it? i need the quickest, easiest way to make this boat waterproof so i can get a month out of it this year at least. it has already been sanded down, just waiting for my next move. any help is appreciated. thanks, -Jason I wouldn't normally think of epoxy as a waterproofing material, but I don't know what kind of boat you have. Here is a quote from _The Gougeon Brothers on Boat Construction_ (fourth edition) "Most available plans for traditional small craft were drawn many years before the development of modern resins. They rely on traditional building techniques ... This sort of construction is not compatible with our methods and, unfortunately, any attempt to blend old and new will probably result in an unsuccessful hybrid." (p7) The Gougeon brothers are the guys behind West System epoxy products. So I would advise you to seal the boat in the same fashion (more or less) in which it was designed to be sealed. I do have a little experience with the aesthetics of applying epoxy to wood. By itself, epoxy is a terrible varnish substitute. It looks great at first, and it is relatively easy to get a nice glossy finish, but it begins to go milky. It will do this very rapidly (in a few days) if it is exposed to direct sunlight. Eventually, it will be kind of yellow and almost opaque. What you can do, however, is apply a few coats of epoxy first to get rapid buildup and a nearly perfect finish with little or no sanding, then apply a standard marine varnish afterwards. (You have to wet sand the epoxy with very fine sandpaper prior to applying the varnish). I'm not sure how this holds up over the course of decades, but it holds up pretty well for interior jobs over the course of several years. Practice on a piece of plywood before you do it on a piece you care about. Also, some varnishes may attack the cured epoxy, so be sure to test the exact combination before using it. HTH --Mac |
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