I am using the above finish for some Maple 2" edging that will get lots of wear. I am brush applying the above Poly. I want a glass smooth final surface. A few questions....

1) for max scuff resistance, was this a good choice?

2) How many coats for max. scuff resistance? I would guess 5?

3) How important to sand between coats? If I want 5 coats total, for good solid thick finish, is it OK to apply all coats a few hours apart,.... (dries VERY fast here) then after thoroughly dry, sand from 220/320/600 to get the glass smoothness I desire?

4) I was planning on sanding with a little distilled water, mainly to reduce the dust... is this acceptable?

5) I assume always sand with hand block, not power sander such as Festool Rotex set on fine mode?

5) What the heck is "water based, oil modified"....it says water based, so why the words modified oil?

Sorry for all the questions :-(
TYIA