Bought the china freight 5" electric sander for my 6 year old to use. I have 3M hook n loop sandpaper for a 6" DA, just cut them down for his with a utility knife, and using the one they gave me in the box with it as a template. We are using 80 grit to strip layers of paint off. Using 80 on a DA or orbital is a little slower, but like barbee6043 stated, its more kind to the metal. A flapwheel on an electric angle grinder will warp it, and divot the hell out of it. 5" china freight sander aint no 6" bluepoint DA but it gets the job done.
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