Black Diamond foam buffing pads IE: Orange, Red, White, Black, Yellow, Purple, Grey, the colour of the pad determines the grade of cut you require and matches the type of paint and the colour paint you are working on...any good panel and paint consumables supplier, you pay for quality...
Flexovit is the brand of sanding disk @ Super Sander "AKA" flapper disks to suit 4, 5, 7 and 9 inch angle grinder / sanders, they are excellent for stripping and smoothing panels, chassis, engine blocks, and parts in general.........there is really no cheap way to strip panels and parts you can you use other methods of course, chemical, blasting and so on, but these are excellent for working at home.........
I use a Ryobi 7 inch variable speed unit, strong and robust with 10 speed selections and well priced, much easier and lighter to use than a 9 inch unit, however you can fit a 9 inch pad on it for the larger areas of stripping / buffing...........