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  #1  
Old 01-04-2010
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My Blisters

While scraping off my old bottom paint and discovering millions of tiny blisters, it seemed odd that the blisters were all concentrated from the waterline to 30'' below water line. Then I found a post by Rich H that may explain this phenomena:
Quote:
Cosmetic gelcoat blisters at the waterline are quite common with some boat manufacturers. The key word here is 'cosmetic' and are probably from 'sloppy' gelcoat spraying of the original layup. Most above the waterline blisters are probably caused by contamination of 'mold-release' compounds that somehow migrate (splashed??) when a contrasting gel color is used/sprayed for the bootstripe.
When I gouged out a couple of the blisters, the white gelcoat falls away and there is red behind it (one of the colors of the boot stripe). The moisture is trapped between the red from the boot stripe over spray and the overlying white gel coat. Can anyone explain in more detail how the boot strip colors can cause blisters?
Photo1: Shows an are that I began scraping off the old blue bottom paint, which exposed the remnants of old red bottom paint and blisters
Photo 2: Shows the size and frequency of the blisters.
Photos 3: Shows a blisters that was gouged out. The are next to the razor blade tip is red gelcoat behind the white gel coat (the other red spots in the photo are remnants of old red bottom paint on top of the white gelcoat.)
Photo 4: Show another blister gouged out to reveal red gelcoat behind white gelcoat.
Attached Thumbnails
My Blisters-dsc_0259.jpg   My Blisters-dsc_0260.jpg   My Blisters-dsc_0263.jpg   My Blisters-dsc_0276.jpg  
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Old 01-04-2010
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I can not explain it ...but I can tell the hull has been faired over before...Slap a couple extra coats of bottom paint on and go sailing and forget about it...my .02 worth... as what I see is not a big deal...If you had deep big ones into the roving that would be another story.
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Old 01-15-2010
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