This is what my wheels looked like:
Here's last night's work:
Firstly, have the wheel mildly clean (thanks Dan ) so the paint stripper can get right to work on the surface
Paint stripper is available at hardware stores and auto stores, usually around $40-50 per 4ltr tin. You tend to go through a fair bit (average about 600-800ml per wheel depending on design) so tell your wallet to be generous!
Grab an old can to pour the stripper into (fruit tins ftw) and a paint brush, and apply the paint stripper VERY generously (you're not even painting it on, more patting it on so it creates a ~3mm thick coat over everything). Give the whole wheel a nice coat and make sure to get into every little nook and cranny because it only works if there's lots there. Remember all your safety stuff: crappy clothing (long sleeves/covered clothes are best, cos this stuff stings your skin), gloves, mask (definitely if you're in a poorly ventilated area)
Do all of the wheels and let them sit for about 10 minutes or so
After this, the paint will literally have bubbled off the alloy surface. It looks pretty gross, but pretty cool Here's what it should look like after soaking in a bit:
The best way to clean it off is to agitate the paint with a wire brush/wool pad (remember your gloves!) and hose it off with a karcher or similar. Unfortunately it was too late to use the karcher last night so we only had normal hose pressure. They were also left a little TOO long, as the paint started to stick back onto the alloy again. Here's the result of the first strip:
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