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I use a hand held belt sander for smoothing off welds I wish to make invisible all the time, it works well although a bit slow. You need to remove as much material as possible with a grinder first and then just "finish it" with the belt sander. I generally use 60 grit. Cheers Andrew

Hi, first post here and I am from Australia so terminolgy might be a bit different. I worked for a local quarry for many years advising and supplying material for jobs exactly like you are wanting to do. The compactable material we would call "crusher run" and my usual advice was to put down 2...