Did you use the wheel paint as the base coat, and bumper & trim as top coat then? As far as the Plastidip goes, I wonder if it would be as durable as the paint. I wheel through a lot of low-lying brush and scrub up here, and am afraid the Plastidip might chip/peel more easily. The Sagebrush which covers our foothills is very abrasive
Naw, I had a couple cans of each and used them up without regard to what I was using, where. I can't tell the difference in the end result. Don't fear chipping paint on rims. It takes less than a second to touch up, if you care, that is. And once you've done it and realize how easy it is I bet you won't.