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Is the * Factory * paint failing, leaving bare metal ? Or am I under the opinion that the factory paint is still good, and the repaint is falling off factory paint ? If the re-paint is failing, leaving factory paint intact, the factory paint was not scuffed up, cleaned up, prior to priming. Primer dampened with oil vapor does this, so does wet sanded primer that was painted while still slightly damp. My advice ... Go to an Auto Body Supply Store, and buy a Gallon of Automotive Finish remover,
much more powerful than hardware store paint stripper. Follow Safety Precautions ! Start by applying a heavy coat to tight areas where a sander won't go. Glop it on, don't brush it out, follow directions on can as to when, and how to remove. Once the ' tights' are done, flat panels are best attacked with a sander, and 120 / 180 grit paper. I don't agree with poster who suggested using 320 grit on bare metal, that's too fine ! Slicks up steel like chrome [ try painting chrome ! ] Red Oxide primer is best choice for rusty metal, allow to cure aprox 1 week, that overcoat with Gray primer for a show quality refinish, skip Gray primer for a ' working girl ' finish. I don't paint for beauty, but rather to protect metal from rust damage. Gray primer has Clay which fills pores and voids well, and sands to a perfect finish, red primer has Iron Oxide, instead of clay, the Iron Oxide ' calms ' rust, and doesn't sand out as nicely.
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