So I hauled out my boat because I saw that there was some antifouling paint
cracking at the boot stripe when I dove on her to scrape the slime away from her waterline. I had to replace some thru-hulls and I figured I'd sand and repaint the bottom while she is hauled out. There is a large buildup of antifouling, probably 20 years worth at least.
Well, upon removing the chips it looks at thought the gelcoat
underneath cracked and is flaking off. It is unusually thin gelcoat
(0.5mm or so) and it appears to flake off in dime sized chunks as I run a scraper across it lightly. The laminate underneath is fine and solid from what I can tell by knocking on it with a wooden hammer, and I don't see any cracks or other suspicious things in it. I checked a few other random places around the boat and it's the same underneath the paint
. The boat does have extensive crazing on the deck
also so I'm not really surprised.
I decided after talking with the yard that I would have everything peeled off (including the gelcoat) from the boot-stripe down and start fresh with a sealer, barrier coat, and new antifoul. So because this is my first time at this, I have a couple of questions:
1. Is there any reason not to have the gelcoat peeled and then apply new gelcoat before the barrier and antifoul? (in consideration of the abrasion resistance gelcoat offers to grounding or such) I know it adds cost but is that the only reason not to?
2. What is the best method of buildup after a peel? I've heard using vinylester resin before or as a barrier coat is a good thing to prevent water
intrusion, but I was thinking Interlux
Interprotect 2000 which I used on a boat years ago with good results.
3. Would it be beneficial to add a layer of glass to replace what comes off in the peeling? I know that supposedly not much is lost
but I wonder if applying a layer of vinylester or epoxy
resin impregated glass would help to seal it and add a layer of gouge protectance?
Any suggestions are appreciated, especially from those who have gone through this...
Thanks and fair winds,