Before sending for sand blasting, make absolutely sure the lip on the ring and rim is okay and solid. I'd hate to see the money spent and have the tire guys refuse to put tires on them.
I have been a loud advocate against powder coating multiple piece rims due to the fact that they can be scratched and chipped when installing tires. I have since changed my mind and plan on having mine done for my COE someday when I find a matching set... They do make a spray for touching up powder coating, but I doubt it's available in all the colors of powder they offer.
One of my greenhouse frames is made of powder coated aluminum and I have a small spray can of material for touching up small nicks and scratches. I assume it's fairly toxic stuff.
Jeff
