Maybe this is old news and I have to check for myself, but.........
I was considering the spray-on liner material for under mat rust protection, as others have discussed or done, but the truck dealer who does the Ultimate Linings system told me he drilled an Av bed recently for a bed slide and the bed surface is composite plastic, not just the sides & tailgate. He said put a magnet to it to prove to myself. He says no need to spend the money for rust protection, very honest guy.
I was considering the spray-on liner material for under mat rust protection, as others have discussed or done, but the truck dealer who does the Ultimate Linings system told me he drilled an Av bed recently for a bed slide and the bed surface is composite plastic, not just the sides & tailgate. He said put a magnet to it to prove to myself. He says no need to spend the money for rust protection, very honest guy.