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The clay is oil based and if you don't get good coverage over the clay with the PVA then your gonna get some alligators as the oil from the clay reacts with the gel coat. The problem with alligators is that there are many causes so you have the try and determine what caused them for each particular incident. For big parts I've learned it's best not to cut corners and to take each step carefully. Alligators suck.
strick
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Could you use patching plaster instead of clay for the radius? I`m about to make my first mold.
Resto is looking very nice.
Cheers,
gfs