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#1
posted to rec.boats.building
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do all (most?) epoxies bond to each other?
Will all epoxies bond to one another? I have some West GFlex, which I
want to use thickened to fill a gap between two loosely-fit fiberglass parts, and some System Three laminating resin (Clear Coat, I think, I don't have it with me right now) that I then want to use with glass tape to reinforce over the surface of the joint. Will the epoxies bond well to each other, if the glass is applied within a few days of the first resin? Also, is colloidal silica and microballons the same? I have an old bag of house-brand microballons from Fiberlay, and colloidal silica is recommended as a thickener. I feel like I used to know the answer to this...but, apparently, I'm an idiot! Thanks, Mike |
#2
posted to rec.boats.building
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do all (most?) epoxies bond to each other?
On Dec 8, 9:03*am, mx wrote:
Will all epoxies bond to one another? *I have some West GFlex, which I want to use thickened to fill a gap between two loosely-fit fiberglass parts, and some System Three laminating resin (Clear Coat, I think, I don't have it with me right now) that I then want to use with glass tape to reinforce over the surface of the joint. *Will the epoxies bond well to each other, if the glass is applied within a few days of the first resin? Also, is colloidal silica and microballons the same? *I have an old bag of house-brand microballons from Fiberlay, and colloidal silica is recommended as a thickener. * I feel like I used to know the answer to this...but, apparently, I'm an idiot! Thanks, Mike Colloidal silica and microballoons aren't the same thing. Colloidal silica will be harder to sand when cured. Microballoons are a lighter filler. As long as you give the first application of epoxy a wipe and a bit of a sanding before you lay on the glass tape, it will bond. -m |
#3
posted to rec.boats.building
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do all (most?) epoxies bond to each other?
On Dec 8, 12:18*pm, max camirand wrote:
On Dec 8, 9:03*am, mx wrote: Thanks, Mike Colloidal silica and microballoons aren't the same thing. Colloidal silica will be harder to sand when cured. Microballoons are a lighter filler. presumably microballons are hollow, so the fillet is weaker with them? As long as you give the first application of epoxy a wipe and a bit of a sanding before you lay on the glass tape, it will bond. It's chilly here this week (Seattle) and my little garage heater is overmatched, so after 24 hours, the first pour will probably be just hard enough to remove the clamps, so still pretty green. I can probably give it a solvent wipe, but not sure about sanding at that stage. |
#4
posted to rec.boats.building
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do all (most?) epoxies bond to each other?
wrote: Will all epoxies bond to one another? There are two (2) types of bonding, chemical and mechanical. Chemical bonding occurs when a follow up layer of resin is applied over an epoxy surface that has not totally cured. Mechanical bonding occurs when a layer of epoxy is applied over a totally cured epoxy surface. You appear to be describing old work, thus mechanical bonding will apply. A small right angle sander with 24 grit discs will be your friend for this job. BTDT, forget the T-Shirt. Good luck. BTW, micro-balloons as a filler will do the job, especially when you lay a piece of glass tape over it. Lew |
#5
posted to rec.boats.building
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do all (most?) epoxies bond to each other?
On Dec 8, 12:28*pm, "Lew Hodgett" wrote:
wrote: Will all epoxies bond to one another? There are two (2) types of bonding, chemical and mechanical. Chemical bonding occurs when a follow up layer of resin is applied over an epoxy surface that has not totally cured. Mechanical bonding occurs when a layer of epoxy is applied over a totally cured epoxy surface. You appear to be describing old work, thus mechanical bonding will apply. The premade glass parts are old (one is "new" but was made at least 6 months ago). Their surfaces to be bonded are fairly rough, so should give a half-way decent mechanical bond. The glass tape is to insure that the load is carried out over a large area of the old hull, since its layup is not terribly thick. But since I'm considering using 2 different epoxies for the fillet and new cloth reinforcement, i was uncertain if they might be incompatible in forming chemical bonds between the two new layers, or if it could be assumed that any two common epoxies would stick to each other chemically if the first layer is only partially cured. Thanks, Mike |
#6
posted to rec.boats.building
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do all (most?) epoxies bond to each other?
mx wrote:
Will all epoxies bond to one another? I have some West GFlex, which I want to use thickened to fill a gap between two loosely-fit fiberglass parts, and some System Three laminating resin (Clear Coat, I think, I don't have it with me right now) that I then want to use with glass tape to reinforce over the surface of the joint. Will the epoxies bond well to each other, if the glass is applied within a few days of the first resin? Also, is colloidal silica and microballons the same? I have an old bag of house-brand microballons from Fiberlay, and colloidal silica is recommended as a thickener. I feel like I used to know the answer to this...but, apparently, I'm an idiot! Thanks, Mike You have gotten good answers, but one thing was not covered. Most Epoxies blush to some extent. If you don't sand both parts, then at least wash them well. You can actually use a detergent and clean water rinse. Matt Colie |
#7
posted to rec.boats.building
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do all (most?) epoxies bond to each other?
On Tue, 8 Dec 2009 13:51:47 -0800 (PST), mx wrote:
On Dec 8, 12:28*pm, "Lew Hodgett" wrote: wrote: Will all epoxies bond to one another? There are two (2) types of bonding, chemical and mechanical. Chemical bonding occurs when a follow up layer of resin is applied over an epoxy surface that has not totally cured. Mechanical bonding occurs when a layer of epoxy is applied over a totally cured epoxy surface. You appear to be describing old work, thus mechanical bonding will apply. The premade glass parts are old (one is "new" but was made at least 6 months ago). Their surfaces to be bonded are fairly rough, so should give a half-way decent mechanical bond. The glass tape is to insure that the load is carried out over a large area of the old hull, since its layup is not terribly thick. But since I'm considering using 2 different epoxies for the fillet and new cloth reinforcement, i was uncertain if they might be incompatible in forming chemical bonds between the two new layers, or if it could be assumed that any two common epoxies would stick to each other chemically if the first layer is only partially cured. Thanks, Mike Essentially "epoxy" is the same stuff, no matter where it comes from. Certainly various sellers modify their product for some specific purpose but basically they are all epoxy. So they will stick to each other. Sand the old layer with a coarse sanding disk, wipe with acetone and have at it. Cheers, Bruce (bruceinbangkokatgmaildotcom) |
#8
posted to rec.boats.building
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do all (most?) epoxies bond to each other?
"mx" wrote in message
... Will all epoxies bond to one another? I have some West GFlex, which I want to use thickened to fill a gap between two loosely-fit fiberglass parts, and some System Three laminating resin (Clear Coat, I think, I don't have it with me right now) that I then want to use with glass tape to reinforce over the surface of the joint. Will the epoxies bond well to each other, if the glass is applied within a few days of the first resin? Also, is colloidal silica and microballons the same? I have an old bag of house-brand microballons from Fiberlay, and colloidal silica is recommended as a thickener. I feel like I used to know the answer to this...but, apparently, I'm an idiot! There are not many things epoxy doesn't stick to. |
#9
posted to rec.boats.building
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do all (most?) epoxies bond to each other?
Bob La Londe wrote:
"mx" wrote in message ... Will all epoxies bond to one another? I have some West GFlex, which I want to use thickened to fill a gap between two loosely-fit fiberglass parts, and some System Three laminating resin (Clear Coat, I think, I don't have it with me right now) that I then want to use with glass tape to reinforce over the surface of the joint. Will the epoxies bond well to each other, if the glass is applied within a few days of the first resin? Also, is colloidal silica and microballons the same? I have an old bag of house-brand microballons from Fiberlay, and colloidal silica is recommended as a thickener. I feel like I used to know the answer to this...but, apparently, I'm an idiot! There are not many things epoxy doesn't stick to. Most poly-type plastics, duct tape, waxed paper, Elmer's glue, White Rain Hair spray (PVA), etc. Things I often use as mold release agents. |
#10
posted to rec.boats.building
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do all (most?) epoxies bond to each other?
"cavelamb" wrote in message
m... Bob La Londe wrote: "mx" wrote in message ... Will all epoxies bond to one another? I have some West GFlex, which I want to use thickened to fill a gap between two loosely-fit fiberglass parts, and some System Three laminating resin (Clear Coat, I think, I don't have it with me right now) that I then want to use with glass tape to reinforce over the surface of the joint. Will the epoxies bond well to each other, if the glass is applied within a few days of the first resin? Also, is colloidal silica and microballons the same? I have an old bag of house-brand microballons from Fiberlay, and colloidal silica is recommended as a thickener. I feel like I used to know the answer to this...but, apparently, I'm an idiot! There are not many things epoxy doesn't stick to. Most poly-type plastics, duct tape, waxed paper, Elmer's glue, White Rain Hair spray (PVA), etc. Things I often use as mold release agents. I'll have to remember that hair spray one. |
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