stripping original paint

i would like to completely strip the exterior of my Duster, its time to get it looking good, now i know there is more than one way to skin a cat. I dont want to use chemicals and my compressor seems to run forever when i use my D.A....that leaves my electric polisher/sander to use for the job, its variable speed and uses the sticky round 6" sand paper on a foam wheel. Has anyone used this method to strip the exterior paint or do you just use the D.A....oh and what grit should i be using...i will be following up with SPI epoxy... thanks for any advice..Rich