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I feel it is. if you look in the gallery section of this site there is a chart showing Amplex Abrasive grit sizes and comparisons. Since Norton and Amplex are all part of the same parent company they...

I will often use the 3.0 micron if just a few passes are needed in order not to have to go the wet route with a Norton. You are unlikely to need anything more coarse although I used to use both 9.0...