I undercoated the whole floor in mine with some 3M undercoating out of a spray can...works good and if u have the back seat out a lot and usin it as a "bed" its cheap and easy to touch up...another option is a bed liner if you wanna spend the time...i use raptor liner when i do truck beds at our shop....cheaper product than an actual spray in but i have done probably 20 trucks and nobody has complained yet...just make sure you get out the scuff pads!