I have a few small spots of bare metal around my blocked filler and i don’t feel its enough to justify buying epoxy primer. I have a gallon of Eastwood 2k urethane primer-surfacer and the instruction say DTM is OK with proper etching. My question is, will eastwood Fast Etch be the right choice? I already have a bottle and i thought of applying some and neutralizing it after it cures with acetone of PRE. I’m worried it will lift the body filler if it contacts it but i have a few spots with no filler that also require etching. If this wont work I guess ill order a few cans of epoxy in aero-spray.