I'm pretty sure it is the FRP stuff. Been about 15 years since I was in the floorcovering business and saw it at a show and in our catalogs. If you go to a major store restroom you will probably see it on the walls. Usually a pebble finish, but the back side is smooth IIRC
ASE Master Collision Tech
"Beast" - 81 "S" W/T, 85-360, T-18, Lock-rite,wag alloys, 31-10.50 Pro Comp MT's, Warn 8274 in a fabbed bumper/deer strainer(tested and approved)
88 XJ, 3" lift, 31-10.50's, custom bumpers and winch/tow bar mounts, Warn 9500HS, custom sliders/steps, camo paint, & headliner
Member: FSJ Prissy Restoration Assoc.