Read the tech sheets carefully.
Some cannot be applied to bare metal, and most have specific unique instructions.
I just read the rust mort tech sheet and you can leave it on or rinse it off, but there is more to it.
I chose the Eastwood stuff because it can be brushed or sprayed, and most important, put over rust or bare metal.
It has it's own special instructions as well, for example must top coat after 4 hours but before 48, can be left without top coat if no direct constant exposure to sunlight, iirc.
Eastwood then Rustoleum satin primer/paint.
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