QUOTE(anderssj @ Jun 27 2018, 06:12 AM)
I figured that I could re-blast then powder coat if I didn't like the way the paint turned out...easier than going the other way.
My nephew has a large powder coating business. . For items that have previous powder coating and needing redoing, the standard practice is one of two processes .
Chemical dip or to bake off the original coating in a 600 degree oven for an extended period of time [until it comes off in flakes].
His company's experience with reblasting old powder parts and wheels, especially aluminum wheels, is the amount of blasting needed to remove powder erodes the metal surface and the contours excessively. . and powder coating doesn't mean it is indelible, it will deteriorate over time.
I looked into this very carefully when it came to restoring my magnesium Mahle gasburners. . You can't chemically dip mag. .{The shop tried a powdered Lamborghini rim once and ended up buying the customer a very expensive replacement] End story is once a mag rim is coated it is a hard to reverse process and retain metal integrity. .