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You have chosen wisely. :)

I've honed a few razors for one of the local Dovo reps & he uses the red followed by the black paste on leather. I don't see him often so it must keep him going pretty well... or he's learnt how to...

You really need to match your paste to your final stone.
If you are honing to 12 k it would be logical to not use anything coarser than .5 micron pastes or sprays altho the embedability of leather...