Scuff real good with 600 grit, wipe with wax/grease remover, one coat of self etching primer, one coat of primer sealer, base coat, then clear coat. I have used clear chip guard down low, before clearing the entire molding.
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1980 Cadillac Coupe DeVille. 6.0 87k
2017 Chevrolet Silverado LT 4.3 Aluminum V6 (My daily)
2008 Saab 9.3 convertible (Wife's Daily)