Thanks
No, one of the wheels had a bit of rash that I needed to fix (have now). But also the garage is only a single so once I coated the car, I parked it in there and left it for a week without touching it. But when the wheels come off, then definitely the calipers will get the treatment. I think the brake dust of the wheels are too corrosive and it probably wont be worth it. I still have half a bottle of coating left so I can do our other car, if I get around to it rather than try it on the wheels and see.