Use the Herculiner. You will be much happier. I was a mechanic for a landscaping company. We used to use roofing rubber in the floor of our vans. We used Herculiner and it worked wonderfully. I also tried the Dupli Color, but it chipped much easier. I was never able to chip the Herculiner though.
------------------
1997 F-150, 4.6, automatic, Dark Toreador Red, Supercab, Flareside, 4X4 Off-Road, Towing Package, Ford hvy dty rubber floor mats, Kenwood 10-disk cd changer, Kenwood am/fm cassette head unit, PYLE 2000 Plus speakers, Ford bugshield, Chrome Grizzly Wrap Around Push Bar with 2 KC 100w Daylighters, Lund Lunar Visor, Ventshades, AVS slotted taillight covers painted to match, Ford bedliner, Lund Premier tonneau cover, cab and bed professionally undercoated, Code Alarm Sure Start RVS remote starter, Ford alarm, Realistic CB with Wilson Little Wil antenna, ported MAF sensor, Motorsport 9mm wires, dual platinum motorcraft plugs, K&N filter, and Lots of TLC!! (Besides being an F-150 nut, I am a Ford auto technician.)
http://njf150truckclub.homestead.com/wyldf150.html