I'm no paint expert, but most primers are not waterproof and rust can start behind it. What I think you need is an epoxy primer, which blocks moisture
Never heard the part about paint not being waterproof, seems to be on most cars.
Anybody who paints metal without using a primer shouldn't be painting. The only exception I know of is Rustoleum and even they recommend their rusty metal primer.
Never heard the part about paint not being waterproof, seems to be on most cars.
Anybody who paints metal without using a primer shouldn't be painting. The only exception I know of is Rustoleum and even they recommend their rusty metal primer.
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