the abbreviation d.a means dual action and is associated with paint preparation , it is a sanding tool which spins and oscillates at the same time , it air powered mainly although electric ones are available . From 40 grit to 500 is for making flat and making a key for paint and 800 to 2000 is for sanding orange peel from new paint which is the same as wet sanding .The discs that you use for a"d.a" are called free cut
Mechanical polishers used with a cutting compounds are, I think what you need. these look similar to disc cutters but work at a much much lower speed .
usual suspects such as bosch , Makita , dewalt , festool, are hi end and come with speed adjustment (recommended)
other makes like titan ,evolution ,works, are all Sh@t
The heads of these tools are foam, stippled foam, and lambs wool type for final buffing
if your gonna do this I would recommend masking anything you don't want covered in compound or polish and use water spray to keep the compound wet to stop burning of the paint and keep the head moving all the time , finally stay away from sharp edges this will ruin the rotating pad . hope this helps
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