Hello Blue_Runner,
What a great place to trade ideas! - I went to the Rino-Liner franchise, but there are others. It was my first transaction I had done with the shop and the guy hit me for $75.00 to spray 2 boxes. You can also find it in auto parts stores to do it yourself.
It can be tinted White or any color for an exact match. It is also treated with UV additives to prevent fading.
I have seen it used to resurface decks and reinforce underdeck storage lockers/live wells. It also fills voids and cracks for a water tight fix. It can be laid-on flat or textured to act as non-skid. It will incapsilate anything it is applied to. The stuff is bullet proof and cleans right up. I also masked the chipped ares by the wheel wells on my truck and sprayed the body with it tinted to match the color. I even used it to seal the roof of my camper. Funny though, I never used it for my truck bed.
My only advice would be to apply as thin a coat as needed, it is HeavY.
Oh yea, in case you were wondering . I do not have stock in the company. Good luck!