Hey Terry.
I did my wheels last summer and did some touch ups on the bumper end caps, front and rear, and other trim. I did scrape the right front end cap the other day on the edge of the garage door and it peeled a little. Probably wouldn't take a lot of heavy abuse without a lot of coats. The wheels have held up well, but I put 4-5 coats on them.
It did a really great job of restoring the deep black of the end caps, which were faded pretty bad ('01 TJ). I'll fix the scrape once it warms up here MI.