[Bob Parmenter]

What Turk is referring to is "officially" called a grill brick. Restaurants use it to keep the cooking grill "clean". Alternately referred to as sh*t brick, for the same stinky reason. It is volcanic material with a high sulphur content, thus the pungent odor.

It is suitable for body work where rapid cutting is desired and will conform as used.

A DA is also useful and will do rapid cut, but takes some getting used to to keep it flat and not do edge gouging, or develope waves.

You don't want to use that long board on highly curved surfaces, you'll end up with flat spots. As suggested, become good friends with your local body shop supply jobber, they can steer you to the right tools and supplies.

Remember to protect your lungs and eyes through all your fun.