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Anytime I have bare metal exposed the first thing I coat with is a self-etching primer. I like to use a CR (chromate) wash two-part self-etching primer made by Sikkens...it will protect bare metal from rusting. I'm sure other paint manufacturers also have a self-etching primer. I then top the primer with Wurth Rust Guard.
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Bob V
1974 911 Carrera coupe Grand-Prix-weiß
1977 930 turbo Carrera coupe Hellgelb
2018 Cayenne turbo Schwarz
2019 911 GT3 RS Schwarz
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