Does flat paint seal metal?

Does flat paint seal metal?

VT Woodsman

Northern Vermont
1978 cj7 304 v8 , 4speed which i think is out of a newer cj. Im pretty sure it has a stock transfer case.
Ive heard rumors that flat paint lets moisture get to a metal surface. I understand how a high gloss paint repels water, but i wonder about flat. I know rustolium makes flat camo colored paint for metal use, so i guess it would be impervious to water and moisture.??
There should be no difference in it's moisture protection, no matter what color. Even with clear. The more important issue is that it's exterior paint and not indoor paint; and it's for on metal.
The best way to seal the metal is use a metal etching primer before you paint.

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