ROCK-IT LINER is a two component protective coating that provides a durable finish with superior protection and chemical resistance. ROCK-IT LINER works great on truck beds, restoration projects as well as for sound deadening. It can be used on wood, concrete, primed or painted metal, and prepped aluminum. ROCK-IT LINER is available in two separate kits, 42250 BLACK and 42260 TINTABLE. Simply add the 42274 CATALYST into the bottles, shake for two minutes and apply.