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Self etching or Sandable Primer?

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I'm sanding some surface rust off the MJ to the bare metal, I bought some sandable primer to spray on the metal, but I noticed alot of guys on here use self etching on the metal. What is the major difference between the 2? Should I take back the sandable and get self etching?

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Get both, start with the self etching, and then top coat as many times as needed with the sandable. The etching primer has a kinda acid based thinner that allows the primer to bite into bare metal better. Most body shops if starting with bare metal, will put a coat of etching primer down first before the sanding primer.

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