[quote=benedict]Hope I'm not hijacking this thread, but after what dennisMe said I figured this was the perfect place to ask:
I've heard gel coat doesn't like to stick to epoxy. Why is that, exactly? Is it mechanical? Or is it chemical?
I've got a ton of holes in my boat (drilled out rivets, moved screws, all kinds of stuff the previous owner(s) hadn't finished working on). I've got at least a full day of drilling out and filling holes before I take this out on the water. I was planning to use West Systems epoxy and filler for this.
I saw a video on Youtube where a guy was patching a hole on a boat. He did the glass work with epoxy, cured it, sanded it, and then put a layer of polyester resin over that to give the gel coat something to bond to. Then he did the gel coat work, sanded smooth, and compounded.
I figured he did that polyester resin step because of the whole gel coat not sticking to epoxy thing. But I thought gel coat was a tinted polyester resin! So do they have the same problems with adhesion to epoxy?
Heck, if I can just sand it 220 to give the gel coat a good mechanical bond, that's straightforward enough. But I'm willing to go that extra step if that's what's called for.
Tom[/quote]
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