Been struggling with a frame that had been powdercoated and a pair of old BMX rims that were powdercoated black but were chipping. I comtemplated sandblasting the frame but they wanted like $75-$125 depending on how long it took them to get the old coating off. I decided to give some furniture stripper a try that i had left over at home first... The results were great. After about 10-15 minutes the powdercoat shrivelled up and could be scraped off with a wire brush. Some areas took multiple applications but probably just because i was impatient... I ended up using that up so i went to home depot to get more and found the extra strength one. Better results!.. In about an hour i had almost the entire frame stripped. Not bad for a $6 can of furniture stripper. Figured i would pass this along.
http://www.wmbarr.com/product.aspx?catid=72&prodid=117
http://www.wmbarr.com/product.aspx?catid=72&prodid=117