I first painted my calipers red. Have done this with many GM cars with great results. Flex calipers started peeling immediately. So.. I got out my wire brush and really roughed everything up, cleaned everything and re-painted. This time it took a couple months for the peeling to start. Gave up and bought Red caliper covers. No fitment issues with my TSW wheels, but haven't tried my ASA's. Removed when I went to stock wheel at Christmas. I still have lots of brake dust with my Stop Tech front pads.