Technical TIRES, white wall tech

This is pretty cool but as I found out the hard way be real careful I managed to slip and grind through my finger nail on my left hand all the way to the pink and yellow stuff inside it using a grinder. I wanted to see how it would work instead of a sander. Cutting it with a regular grinding wheel made my white wall nice and slick w/o any cracks but its hard to handle with the speed its moving. My hands are still a little to shakey to make a nice smooth line. But I'm going to keep practicing on junk tires but with a sander I found.