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Señor Member
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1,457 Posts
Yeah, if they're 1/16"(+) they are almost certainly deeper than the barrier coat since most barrier coats are recommended to be between 20-30 mils (i.e., up to 1/32" give or take.) Of course, whoever applied the barrier may have gotten all fired up and gone really heavy with the epoxy but I wouldn't bet on it.

Did any fluid drain out of the holes when you drilled them?
 

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Señor Member
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1,457 Posts
There was no fluid in any of them. The depth varied but all appeared to be filled with dried bottom paint. The boat has been out of the water since November so they have had a chance to dry.
I know blistering is a gelcoat phenomena but I believe I read somewhere (I think in the Interlux Interprotect literature) that barrier coat can also blister. And anything is porous with time and pressure.

SD - what is a fisheye?

I now have them all filled but my interest is in not ending up with the same thing after I apply the additional barrier coats I'm planning on applying next. So I'm trying to figure out what caused them.
Sounds like you're safe for now. If they were allowed to thoroughly dry before you filled them, and you filled them properly, you shouldn't have any surprises next time you haul.

Blistering under the barrier coat is my major headache this winter. A PO apparently applied the BC over a wet hull. I've got hundreds that I ground out, and I'm waiting a few more weeks to fill and fair. Fortunately, I've had the hull in heated storage. Had I known the extent of the problem when I hauled, I would have gone for a full peel instead of just addressing them individually.
 
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