How important is self etching primer when using bedliner on flares / bumpers?

Moab

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About to do my flares and bumpers with Rustoleum Bed Liner. How important is self etching primer? Or will just good prep with some light sanding do the trick? Especially you guys who've had it on for awhile.
 
Self etching primer goes over bare metal. If you're down to bare metal, use that or epoxy primer. Epoxy primer can go over paint if it's sanded and cleaned properly.
 
If it’s bare metal then it’s important to use self etching
 
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