It's time to retire my 20+ year old BFG tires. So, I'm planning on refinishing my N90's before I swap tires. I've read several posts by Twisted Metal and others on the topic. I'm looking for a sanity check so I don't do something stupid. My plan is to use a fine aggregate in my sand blaster and blast the old finish off the rims. I have a lot of tar and baked-on crud on the inside (back) of the rims as well. Then, I'm hoping to polish the machined surfaces, and then paint / clear coat the originally painted surfaces (after masking the machined surfaces off). My concern is over blasting the machined surfaces. Will this do more damage than good?