On ship shape tv a week or so ago they had a guy with a tool that went around grinding bottom paint/gel coat off, right down to glass. They main reason was for curing osmotic blisters. It was a really cool tool, i don't remember what it was called. but it just ripped right down to bare glass and had all sorts of depth controls so you got a nice even finish. maybe if you set the tivo to record all episodes of shipshape tv you will find it, because they do a lot of repeats.
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