Hobby shop clay works as long as you don't get the kind that hardens when you bake it. It can be hard to find the old style oil based clay, but it works just fine. Make sure to get good coverage over the clay with your PVA or the oil in the clay will cause your gelcoat to alligator.
Dave
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Blue Heron Boat Works
Reinventing the wheel, one spoke at a time.
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