Austin
FTF's #1 Knob Polisher
FWIW...I had a long talk with the bodyshop that is doing my 79 and I brought up bedliner as undercoating. They suggested that I don't, as it can crack and trap moisture. They suggested a POR15 coat then a matching body color. I did a bunch of reading and called a few other places and that was the general consensus.
I didn't know that. Good to know.