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I too eliminated the scratch coat... almost. Silvers/metallics create an adhesion problem. UPOL works ok on them and like Paul said sometimes I wont even use epoxy or anything else just UPOL.
Mostly now for me its straight urethane clear. Easy, quick, OK not great.
On the adhesion front Ive done a little experiment with spray painting the plug quickly all coats and spraying the clear urethane while the silver (at the very least) is still wet. Seems to have worked. Rattle can paints mind you.
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