Rhinoliner Is Awesome.. My Whole Floor In My Box Truck Is Done In Rhinoliner.... I Also Hear Good Things About Linex As Well... I Have It For Alsmost 5 Years And It Looks Brand New...its Worth Every Penny.. The Other Option If You Want To Do It Yourself Is To Go To Autozone , Pepboys Or R&s Strauss And Buy Herculiner Its A Very Good Product... These Stores Only Sell It In Black .. If You Go To Herculiners Website You Can Order It In Gray .. I Used This Product On The Whole Underneath Of My Box It Holds Up Awesome... This Would Be The Cheapest Alternative And Would Hold Up The Best Opposed To Stains And Paints..