Firstly if you are going to switch to Rejex and have some other product on the finish be sure to wash with dawn or something similar to remove the old stuff. I think that is mentioned on the Rejex bottles. If not it is mentioned on the Web Site for the first application. Secondly, I am not sure what your J-wrap is. Are you talking about the diamond protection plate or is it something else? I have used Rejex on the orange-peal finish of my UTV and it comes off fine. Don't let it dry for a long period of time, or it can become a little difficult to remove. Here in the "dry-heat" I don't let it go a full 20 minutes that is recommended because it is dry much sooner than that.