On that undercoating, did you do any prep work? How did it turn out? Did you do the frame as well? I am looking to clean up under the truck as well. I was told to use lizard skin, but dang that stuff is spendy...
I hit the sheetmetal with a wire brush and sprayed 2 coats.
I didn't do the frame rails....yet
Turned out alot nicer than I thought it would. The 3m covers really well. I didn't worry about
overspray down there but it didn't seem to have much anyway. It's a heavy paint and tends to go where aimed and nowhere else.