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post #2 of Old 10-12-2012
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Re: Proper Tool for grinding blisters

I just finished closing 2 thru-hulls for an old toilet I am no longer using. I used epoxy directly on top of sanded fiberglass after I filled the holes from the inside 1st. I sanded the area to scuff it up for adhesion, wiped with acetone and applied my resin. After it cured, the next day, I sanded it smooth and the bond was excellent. I feathered the edges so thin you can't feel them at all with your fingers. What you are doing here is applying a thin layer or "Film" of epoxy over the area you wish to repair. If the surface underneath is clean fiberglass, the epoxy WILL bond. I use the MAS brand "Flag" epoxy and swear by it. I use SLOW hardener to give me plenty of time to work, but if its cooler where you live go with a faster hardener. My boat was built in 1967 and the glass is pretty stout. I trust my repairs since my holes were quite large and well below the waterline. (btw- I did reinforce with layers of cloth on both sides, since I had so much area to cover)

I'll do anything to help you out... Bruce
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