Question about sandpaper grit

Quick questions, just looking for sandpaper schedule to follow for epoxy (using RR):

- What grit do you use to finish the foam portion of the board?

- Same question for spackle?

- Same question for laminate coat?

- Same question for hot coat? (also is there a different between the type or additives used in the epoxy from the laminate coat to the hot coat?)

- Gloss coat etc.?

thanks