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Monday to go to buy sandpaper 80 grit. I need to always use so many leaves of sandpaper? better to buy the stone to flatten not to use as much sandpaper?

Thanks for your help

He is not new. Only flat in center in the corners he is but low. I have used 3 leaves of sandpaper.

Greetings

I have used 3 to sandpaper waterproof grit 220 in my Norton and still he is not flat. I have drawn the grid and single he is flat by the center. The maintenance of this stone has to me very tired...