You can paint over powdercoat. You'll need to scuff the surface first with a grey scuff pad (or fine steel wool) so your paint will adhere to it. Lots of people are using bedliner...I like the rubberized undercoating even better because it typically will have a little less texture to it. Not sure if you are looking for a flat black or not though...if you want a satin finish, VHT epoxy is great stuff! You can find it at about any auto parts store...I just used it on my top and it refreshed the black nicely and doesn't have a shiny finish either, just a slight sheen to it
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