Ok what you'll need to do is sand the casting down first off. I'd go up to a 400-600 wet sand. Make sure you have a nice satin look to it. Thats the first step you should take. I'd suggest picking up a bench top buffer for $75-$100. It will be the best investment you make. Something in the 1/2-3/4 HP and 6-10 amp range will be perfect. I highly doubt the die grinder with a 6 inch wheel will get the job done, and if it does it may take a few years. The reason the compound may not be taking to the wheel is it may be spinning to slow with a lode to melt the compound. Also, did you rake the wheel before attempting to apply compound?
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