[Dion Hildebrandt]

probably over kill, for base/clear we will sometimes use 800 grit wet, but actually prefer 500 grit on a precision orbital sander, and red scothbrite for the edges. Our single stage jobs we usually paint over 320 grit with great success. Everyone will have their own opinion ,but if 1500 works for you keep on keeping on!

I have used the ppg Omni in the past it is decent, user friendly

the 500 grit on the orbital would be used dry, fwiw