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Yea, 400 and 600 are the two I use most, I keep 3 wheels loaded with 600, fully loaded, half loaded and lightly loaded.

As one wear out the grit, I reload it and the others move up. I use the...

You don’t need variable speed, many of us have used the HF 3400 rpm 6 in buffer for years.

Smaller 3-4 in wheel are fine, 6in is too fast and dangerous for razors. Razors are thin and heat quickly.

You don’t need multiple buffers, just 2 wheels, for each grit or compound while one is drying, you are using the other.

I use 600 greaseless most, I keep 4, wheels loaded with 600 greaseless. 2...