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"I have both 1 and .5 micron sprays, both from SRD. My understanding is that 1micron is about 14k grit, so why skip that?"

It is not just about the grit size, Diamond in particular is very...

Nope, the work horses are the 1 & 8K the 12k is a great finisher, but you should be getting great edges off an 8K.

Your edge does not get straight until 8K, so a 3, 4 or 5k is just a step, either...