Bob,
If you are going to do some testing, I would like to see your results. Even if we can not obtain the stuff you use. I'm kind of on the same fence as Smalljaw. I am not a big believer of the UV thing. I know sun and water , hot an cold are brutal on a cars paint or other things that come in contact with the elements. However, I don't buy into all of the data about it being needed for jigs and crankbaits. I lose more jigs than I worry about sun bleaching the paint or it yellowing a topcot. However I do believe that over time the sun will do just that. I guess my point is that if I have to spend $3 more per ounce of powder paint or per ounce of top coat, it is not worth it to me. Just my honest feedback. However I am very curious how your testing will go. Please keep us informed.