Found a guy in VA Beach. He told me the "burn thru" is actually the primer that was applied to the fiberglass before the gelcoat was shot. Dark primer helped show the coverage depth of the gelcoat while it was being applied.
My son, the painter, said Dad toss the plastic spreaders and get some flex puddy knives. I got a 1 1/2 & 3 inch knife. Seems to be helping a lot getting the air out of the gelcoat. I'm going to try a foam brush to apply the gelcoat over the spots where the primer shows thru. If this doesn't work, I'll have some Rustoleum paint tinted and apply it with a foam brush, Then wet sand just enough to get it smooth.
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