This technique is not new, and I've been using it for close to 40 years, but it's amazing how many people (even pro spray painters) are unaware of it.
The reason you want to do this instead of using a hard block and sand paper is that for one, a block will never cut the high spot down level without also taking material on either side of the dust or run. In high gloss finishes it's imediately evident.
The second reason is often a dust speck will have a very hard piece of junk in it. When you attempt to sand it out level often that piece will break free and roll with the sanding block and really deeply scratch the surface. Much like sanding with far too coarse of paper.
Got a new way of doing something? Or maybe an old method that needs some clarification.
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