You could also use roll in or spray in bedliner..I have used it for truck tubs and it works great .Just be sure to prep it good..I have a blazer with it exposed to rain and mud and various rodents .And it is holding up after 4 years .I would imagine it could last forever under a carpet..And has sound deadening properties ..The best way would be to totally strip the interior and bring it to a pro bedliner shop and let em do it right..But you can get rattlecans of it at walmart....