I've looked into this for other uses......here is a company for the DIY'ers. They have colors....... Wal-Mart has it in black........
http://www.durabakcompany.com/google-durabak.htm
I did question if it was rolled on if it was as smooth as being sprayed on......
But if a person did the bottom as he was building it, then had a bedliner company shoot the upper side, $300 would'nt be bad. I do not know the spray business well enough to do myself.
This would work for a very utilitarian TD. Just pressure wash it, Armor -All it, and you are ready to go camping!!!!!!