What is the besr spray in spryliner and how much and also the kits you get at auto stores that says do it yourself are they any good thanks

 

i got my screw line-x'd when i bought it. cost me 399 for black. i had a do-it-yourself kit and it sucked. when i threw something heavy in the back (motor block) or something real abrasive (gravel, firewood) it would rub some of it off. i would never waste my time with a do-it-yourself kit, if you USE your truck anyway.

 

speedliner-- it is as tough as line x or tougher with a smooth finish/texture to it, not like coarse sandpaper.