Home |
Search |
Today's Posts |
#11
posted to rec.boats.building
|
|||
|
|||
sealing plywood end grain?
What if he used "Gorilla Glue " on the exposed edges ?
|
#12
posted to rec.boats.building
|
|||
|
|||
sealing plywood end grain?
Phil wrote:
What if he used "Gorilla Glue " on the exposed edges ? It's hydroscopic - absorbs water. Not exactly what you would want for a waterproofer. Richard -- (remove the X to email) Now just why the HELL do I have to press 1 for English? John Wayne |
#13
posted to rec.boats.building
|
|||
|
|||
sealing plywood end grain?
Pete C wrote:
When building with non-marine ply, try boiling an offcut to test for delamination. I have seen this advice a few places, and I know that to qualify for marine grade, plywood has to survive some heavy boiling tests. But I don't understand what boiling has to do with endurance in marine environment. Most of us don't sail in waters anywhere near boiling temperature. -H |
#14
posted to rec.boats.building
|
|||
|
|||
sealing plywood end grain?
On Tue, 27 May 2008 00:24:00 +0200, Heikki wrote:
Pete C wrote: When building with non-marine ply, try boiling an offcut to test for delamination. I have seen this advice a few places, and I know that to qualify for marine grade, plywood has to survive some heavy boiling tests. But I don't understand what boiling has to do with endurance in marine environment. Most of us don't sail in waters anywhere near boiling temperature. -H Boiling speeds up the breakdown process so you can find out quickly if the ply is any good. A better test would be to make up samples and leave them in the expected enviroment for a few years to see if it will stand up but nobody wants to wait that long. |
#15
posted to rec.boats.building
|
|||
|
|||
sealing plywood end grain?
"cavelamb himself" wrote in message ... Phil wrote: What if he used "Gorilla Glue " on the exposed edges ? It's hydroscopic - absorbs water. I understand that but doesn't it become waterproof when it's cured? I haven't tried it but that stuff seems to go into porous surfaces very easily. |
#16
posted to rec.boats.building
|
|||
|
|||
sealing plywood end grain?
Phil wrote:
"cavelamb himself" wrote in message ... Phil wrote: What if he used "Gorilla Glue " on the exposed edges ? It's hydroscopic - absorbs water. I understand that but doesn't it become waterproof when it's cured? I haven't tried it but that stuff seems to go into porous surfaces very easily. No, over time exposure to water will destroy the strength of the bond. Richard -- (remove the X to email) Now just why the HELL do I have to press 1 for English? John Wayne |
#17
posted to rec.boats.building
|
|||
|
|||
sealing plywood end grain?
Brian Nystrom wrote:
cavelamb himself wrote: Brian Nystrom wrote: patrick mitchel wrote: a stitch and glue kayak made from lauan ply (the cheap doorskin/non waterproof). Kept under cover in the mild southern california coastal climes. Showing delam in the areas where the ply has extensive exposure to end grain (cockpit coaming, hatches). Also occasional splits on the sides where impacts have occurred and allowed to open a bit. What's the best strategy to keep splitting to a minimum (yeah, I know, marine grade ply. Aint gonna happen- not in the budget.) When building the boat might the best strategy have been a couple layers of thinned epoxy to penetrate the end grain and flat surfaces given me a better chance of not having to deal with this fairly minor problem (considering the age of the boat is approaching 10 yr old) It was fun to build the boats and the one that spent the majority of it's life in a garage looks a lot better in the splitting dept (or the lack of splits). Thanks Pat You've answered your own questions. Build the boat with the right materials (marine grade ply) and seal it with epoxy. Is the boat sheathed in fiberglass? If not, it should be. The bottom line is that if you build a boat to last, it will. If you build it cheap, you have to regard it as disposable and/or expect to repair it frequently. You can't have it both ways. You may also want to check the manufacturers data with regards to thinning epoxy. Most of them say don't do it. My understanding is that thinning epoxy just makes it porous when it cures, as the evaporating solvent leaves behind passages in the epoxy. I'd guess that you could thin epoxy with about 10% (max) solvent by volume without much of a problem. It wouldn't surprise me if the reason manufacturers don't advocate much more than this is primarily because the environmental police would come after them for releasing to much solvent vapor. Boden |
#18
posted to rec.boats.building
|
|||
|
|||
sealing plywood end grain?
I'd seal the end grain with acrylicexterior latex paint.
Best stuff. On Jun 8, 10:46*am, Boden wrote: Brian Nystrom wrote: cavelamb himself wrote: Brian Nystrom wrote: patrick mitchel wrote: a stitch and glue kayak made from lauan ply (the cheap doorskin/non waterproof). Kept under cover in the mild southern california coastal climes. Showing delam in the areas where the ply has extensive exposure *to end grain (cockpit coaming, hatches). Also occasional *splits on the sides where impacts have occurred and allowed to open a bit. What's the best strategy to keep splitting to a minimum (yeah, I know, marine grade ply. Aint gonna happen- not in the budget.) When building the boat might the best strategy have been a couple layers of thinned epoxy to penetrate the end grain and flat surfaces given me a better chance of not having to deal with this fairly minor problem *(considering the age of the boat is approaching 10 yr old) It was fun to build the boats and the one that spent the majority of it's life in a garage looks a lot better in the splitting dept (or the lack of splits). Thanks Pat You've answered your own questions. Build the boat with the right materials (marine grade ply) and seal it with epoxy. Is the boat sheathed in fiberglass? If not, it should be. The bottom line is that if you build a boat to last, it will. If you build it cheap, you have to regard it as disposable and/or expect to repair it frequently. You can't have it both ways. You may also want to check the manufacturers data with regards to thinning epoxy. *Most of them say don't do it. My understanding is that thinning epoxy just makes it porous when it cures, as the evaporating solvent leaves behind passages in the epoxy. I'd guess that you could thin epoxy with about 10% (max) solvent by volume without much of a problem. It wouldn't surprise me if the reason manufacturers don't advocate much more than this is primarily because the environmental police would come after them for releasing to much solvent vapor. Boden |
Reply |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Birch Multi-layerr plywood versus Marine Plywood | Boat Building | |||
Once again, presented with a grain of salt: | General | |||
Presented with a grain of salt | General | |||
Use your charts with a grain of salt. | Cruising | |||
plywood grain direction | Boat Building |