Good luck! I use the common 3M wet-or-dry in 320 with water for rough leveling of epoxy lumps on a block. I then go to 400 then 600. Try to stop before you need to re-epoxy.
If I dry sand I use Norzon (blue) paper... it does the best job IMO on epoxies and water-based varathanes. Adalox 271 is my favorite for dry-sanding oil finishes, but it cannot tolerate pressure or heat when you are doing it, so go slow.
I do not apply oil over a wet-sanded finish for at least 24 hours to reduce any chance of blush... in wet climates it may take longer. I also apply a little heat to speed drying after wet-sanding.
Does this help?
art
