50yr old substrate sometimes does weird things when sanded on and painted with a high gloss finish, the light layer of epoxy and cloth just prevents any uglies from coming thru the finish paint later on, its completely cosmetic. Checking is the only word i could come up with haha.
Smelly shit is poly or vinyl. Check out 19 sternrider, i did exactly what youre describing…page 5 of rebuilds
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