Would someone explain why paint would blister in this situation?
It’s my understanding that once paint, varnish, poly, whatever is fully cured out, as I hope a 80s boat would be, that prep is the only thing that matters and you could coat with whatever product you choose?:???:
Not necessarily true. If you were to say use a etching primer which is what is used on aluminum and bare metal on spots you burnt through sanding it could soften up the cured paint that it got on and make it peel away.
Also some paint products just don’t jive with others and will tend to fish eye or solvent pop on you which sucks because you have to resand it all and respray.
The best method for a full restoration is to to strip all old paint off with a orbital sandpaper and some 180 grit. and use a etching primer on it and a good single stage urethane topcoat and you shouldn’t have any problems with adhesion issues or solvent popping.