Home depot sells wet grits from 400-3000 sized for sanders . Micro Mesh is also delightful .
I reverse the normal scaled finishing grit process so I only remove what is absolutely necessary to get the desired finish.
As a Luthier ,the trick is NOT to leave any scratches , which is why I don't use scotchbrite although it does the job.
I double a piece and put the guitar in the normal seated playing position and run my hand GENTLY up and down the neck 10 passes at a time , clean -check and proceed .
I HIGHLY recommend Frog tape, the blue painters tape has a tendency to bleed, frog tape doesn't .. worth the extra
Of course if you want to address any carve issues , i.e. modify the contour , then I'd start with 320, and respray with satin nitro . I did this on my Special Arist so I could fine tune it and match the top River blue on the satin natural Flame neck, knowing full well it "ruined " the re-sale . I kept the front and back of the headstock natural , The results were great and I love it.