I am building a tire carrier on my existing powder coated bumper. Have you tried to paint over it or am I going to have to do the obvious and sandblast the coating off.

Powdercoating is a waste anyway. It gets all scraped up and needs a touch up anyway.

I have done it before and it (the paint) flaked/scraped off the powdercoating easily(paint came off not pwdcoat).. not sure if it was shitty paint I used but I wont do it again unless someone posts that it works fine as long as you have quality paint :D

you're gonna have to sand off the powder coat atleast to the point that it isn't shinny anymore. we have to do this at work with our re-work stuff that has to be re-powdercoated.

-Scott

You need to sand it a bit to give the paint something to bite to.
Good paint is a must. Powder shops have touch up for most of their standard colors, custom mixed to match. Works well.

No one mentioned the other obvious point about surface prep: the part has to be clean (degreased) and dust free.

I paint over powdercoating all the time and it never peels. I am not certain, but it may have something to do with my prep and the paint I use.

The paint is the Rust-Oleum version of the Hammerite hammered metal finish. For prep I just use Scotch-brite pads and knock off the semi-gloss finish until it's dull. I also make sure I get the edges of stuff really well as stuff has a tendency to start peeling there and not stop.

Before I break out the rattle can, I wipe everything down with denatured alcohol. Leaves the powdercoat a little bit tacky, but not too much.

I just figured powdercoat is a really good primer.

Bob,

I have found that marine prop paint to be highly durable and coats very well. Not to mention that it does not come off very easily.

Plus you have your choice of black or black.