[928ram]

Randy,

When you start talking "layers", stripper is probably the best way to go. The mess may seem like alot but in the end I think that you'll save time.

As far as sanding, be sure to use coated abrasives if you aren't already, automotive app. abrasives seem to work a bit better in the anti-clog arena but you'll need to switch to the wood app. stuff as you get down to wood since the automotive stuff will leave stains.
As procon suggested, the eraser type sandpaper cleaner helps alot, another trick I use is to take 3-4 pieces of straight wire (I use old coat hangers), bundle them together at one end with masking tape, and use this to whip the bottom of the sanding pad when it gets loaded up. This method works suprisingly well on paper loaded up with bondo/auto paint.

Lastly I'll put in a plug for the Porter-Cable model 7336 sander, it's a 6" round pad variable speed random orbital sander; basically an electric version of the standard automotive DA sander. Awesome tool that should be purchased with both the sanding and the polishing kit and should be in the garage of every woodworker and car nut.