I have 3M's rubbing compounds and the rest of the three stage stuff. Idk about any other but I'm satisfied that it's the man running the buffer, not the buffer or the brand on the bottle.

If you're intending on removing any significant amount of paint you're going to have to mask closely. Remember, what you take off of the hump will also be taken off the areas close to it if they are not protected.

Mask the hump off and try 3K or 2500 grit wet and work your way toward more coarse grits if needs be. I'd suggest you take a little off then pull the tape and wipe down with a good cleaning solution and evaluate how much you've removed. I do not recommend you trying the entire project but rather experiment until you have a system working. One or two linear feet to start with.

If you have a spare door try it and develop your skill on it before you attack your car with sandpaper.

__________________
84 300SD
85 380SE
83 528e
95 318ic