[Rasper]

Go to Caswell's online catalog. Click on the tab up top that says, "Buffing/Polishing". On the left of that page under "adaptors" click on "Grinder/Buffer Adaptor" There is a good photo of a set up that should be just the thing for your heavy tank.

I polish a good bit of stainless. To sand it I use a 3000 rpm machine with a soft pad. I usually start with 150, unless the metal is scratched badly, in which case I use 80 first. I go 150, 240 and 400. Sometimes I use worn out 400 as a finish sanding, and sometimes I go to 600. Then I go to emery on a stiff regular cloth buff. Then green, then chrome rouge.

One thing: Stainless loves sandpaper; it eats it up. You might as well buy a lot of it. Stainless is hard. It is hard to cut; it is hard to shape; it is hard to planish; and it is even harder to sand. The funny thing is: once I get it to the emery buff it polishes up fast. You need to bear down on it some, but it comes right up.
The important thing is, (and no one wants to hear this), you absolutely have to sand out all (and I mean ALL) of the scratches left by the previous grit sandpaper before you move on to the next. This takes a lot longer than you think, especially with stainless, a whole lot longer. But if you don't get them out, you will have to go back and start over again.

Richard