As far as the end result is concerned, I wouldn't worry that much.

Assuming the sandblasting is thoroughly and carefully done, the finished product will look fine. The process involves spraying a charged enamel powder onto the bare metal, then baking the powdercoated rims in an oversized oven.

Under high heat, the powdered enamel then melts and forms a very tough finish over the entire surface of the rim. You'll be able to pick your color as well as the level of gloss, so choose carefully... if you change your mind after the process is complete, you have to re-strip the rim and start all over.