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[David Van Denburgh]

Dwayne,

It sounds like you have an ablative paint. Most ablatives tend to build up over time. If you're having widespread adhesion problems, and you have a thick buildup of paint, I'd say it's time to take it back down to well-adhered material and then add your topcoats.

Sanding ablative paints is nasty. I recommend a quality paint scraper - it works better and faster, creating less mess.  I scraped the old ablative off our Cape Dory 36 (down to the barrier coat) several years back before repainting with VC-17 (we're Lake Michigan sailors).

Good luck,

David



Message: 7
Date: Tue, 30 Apr 2013 07:03:49 -0700 (PDT)
From: Dwayne Back <sifuback at yahoo.com>
To: Alberg 30 Public List -- open to all
        <public-list at lists.alberg30.org>
Subject: [Public-List] Painting below water line
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        <1367330629.58449.YahooMailNeo at web122205.mail.ne1.yahoo.com>
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I started to sand the bottom paint this year in preparation of a couple of new coats and noticed some areas that there was adhesion failure. ?I began scraping and found that there was a general adhesion failure. ?I have scraped about 1/2 the boat and find that ~10% scrapes all the way to the gel coat in various spots with the remainder being covered by what look like 1-2 coats of an unknown paint type that appears to?adhere?reasonably well. I purchased Micron CSC (fresh water boat), before I discovered adhesion failure, which is supposed to be?compatible?with a wide variety of paints. ?My questions are whether it is best to just sand and paint as is, or would it be better to sand all the way down to the gel coat and start fresh? ?Should I do anything extra to protect the exposed gel coat? ? If I sanded all the way to the gel coat could I do more damage than good? ?Thanks for the feedback.

Dwayne
#94

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