If your using it for protection I would use undercoating, if your using it for looks I would use paint. I respray my frame and such for shows every now and then but I undercoated my rear wheel wells so they would be protected.
I want to spray it to look good. My Pro Comp MX6 shocks must have been painted with white wash! My truck sits up and you can see the undercarriage. It makes the truck look much better. I am going to paint with undercoat spray under the bed. The rears,frame and everything else black paint. What is better flat black or glossy?
This Sunday when I install my toys I am going to paint the undercarriage of my truck. Do I use black paint or a rubber undercoating?
Hey Sam if you haven't already or you can still do it over the paint I am very fond of the DupliColor Spray bedliner. It sticks where ever you spray it and is very durable. I even did the steel wheels on my full sized Bronco with it.