I bought a pretty cheap electric 4 1/2" angle grinder and some flap wheels to use for my deck replacement. I cut out the seat bases today with my sawzall, and then i tried grinding the remainder away. The flap wheel (60 grit) kept bogging down the grinder and i didn't get much accomplished and ended up burning out the grinder. Was my grinder just too cheap? What kind of grinders do you guys use? I'm assuming with a better grinder I should get better results... It took like a 1/2 hour to grind out about a 7-8" section of 1/2" plywood/fiberglass that was only and inch wide. I'm assuming it was the poor torque of the grinder and it bogging down that caused my problems. Thoughts? Is a pnuematic grinder better than and electric for this purpose?