I have used liquid bed liner, specifically Duplicolor brand.
It comes in a very thick consistency, sort of like wood glue.
You can brush, roll, or thin it and spray on.
Brushing and spraying gives you a textured finish but brushing lets it run out smooth,
so brushing is the way to go.
It's thickness also allows it to settle into pits in the metal giving you even more smoothness.
Before applying, thoroughly clean the surface and prime with Rustoleum Rust Reformer.
All that being said, NOTHING you can apply will last indefinitely, so if you are looking for a one-time fix,
keep looking.
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