Originally Posted by SpicedCrusher

Because there are oils and other containment's that get on the bare metal. Plus a sandblast gives a better adhesion, although this is mostly done prior to powder coating. The old wipe down with some mineral spirits and a rag would also do the trick. After a bumper is sandblasted it is bare and exposed to the elements. Any moisture in the air will cause your part to begin surface rusting. Although this may not be very noticeable to the naked eye, it will be present. The presence of this microscopic surface rust will compromise the adhesion of especially powder. Basically if your going to sandblast something prior to, it is best to apply what ever you are going to apply in a reasonable time frame thereafter.

Originally Posted by karls

I took 2 days to paint my bumper- laid it out on a trashcan and did one side then flipped it and painted the other side the next day. Seems like everyone likes the bedliner but I am disappointed that I went with it- and I even got "the one with real bits of kevlar in it"

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Originally Posted by jstikel3

Thanks for all the input guys. Why were you disappointed with the bed liner? I have debated between that or rustoleum textured paint but I would imagine the bedliner would be a little more durable than just a paint.