Going to test my Pettit easypoxy on a canoe I have first to gain confidence in rolling and tipping. To get canoe ready to paint, I faired gelcoat holes with Totalfair, then while experimenting with my waxed evercoat gelcoat, I realized it definitely does not bond to total fair. Which makes sense, since it's porous and I forgot to seal it with a coat of neat epoxy. Also it could've blushed I suppose.
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Also did a test with the gelcoat on raw wood, laminated wood, and 3m filler'ed wood. The 3m filler bonded and cured the best, and the rest of it seemed to cure only if I laid it on thicker. The thinner spots didn't cure at all. But that wasn't the case on my previously-gelcoated canoe - everything seemed to cure except for the spots with fairing compound.
I have PVA and spray bottles but from what I read that's only for unwaxed gelcoat.
Tomorrow I'm going to do a test with gelcoat on:
-"dry" fiberglass (roughed up part of floor that doesn't look well-loaded with epoxy)
-epoxied glass on floor
-3m'ed floor
-totalfaired floor (after de-blushed and neat epoxied)
-primer'ed floor (old primer from sanding paint off, or maybe it's bondo who knows)
- testspots.jpg (109.69 KiB) Viewed 354852 times
I ended up calling System three and they told me their epoxy doesn't bond to gelcoat, but I think they're just going on the assumption that epoxy never does, which is demonstrably untrue according to boatworks today video:
https://www.youtube.com/watch?v=kHAbygl ... b_imp_woytGood thread on the subject:
https://forums.sailinganarchy.com/index ... wont-cure/