[bigboy111]

I like a 24 or 36 grit on a 3 inch roloc disc. These are made by 3m and they are real easy to use. They twist on with a quarter turn onto a quarter inch arbor that goes in a die grinder. I use a right angle air grinder. You can get one at harbor freight for about ten bucks, or you can buy a real good one for about forty bucks at northern tool. Harbor freight probably has the arbor and chinese discs too. You can use a coarse disc on an electric grinder also but be careful not to overheat the panel. The air grinder runs slower at about 90 psi and wont build up as much heat.
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