I think the Herculiner is the best store bought brand liner. I just sprayed the tongue of my bumper pull with it. I have also sprayed both of my trucks beds with it and it holds up to the abuse so far. The onlything I don't like about it, is the sun will cause the glossy finish to go flat in about 4-6 months. My wife likes the flat finish better, I kinda like the glossy look.
How many gallons did it take to do the whole truck?