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I wish I had something smart to say but I do not. I am glad you found a sandpaper that works for flattening. Mirka does make a quality product, I am not sure what was up.

Charlie

I hope I answer what what you wanted to know. Here is my take on the two types of sandpaper pertaining to sanding metal.



Silicon Carbide W/D


will abrade steel
works well with most ...