I haven't had my Ranger long enough (bought on New Year's Day), and it's been too cold (no garage, in Iowa) to do one just yet. But, I do have a CJ-7 that I've applied the Herculiner kit to the entire inside of the body-tub. I did this about 6 years ago, and it's still going strong. I double-coated the footwell areas, but the rest has a single coat. Easy to use, too. I actually brushed mine in, instead of using the roller that came with the kit. Just make sure to mix it well, and stir it occasionally during the application. I also used some on the other half's '85 Cherokee, on the rocker panels. Painted over it, never had a problem with it, either.