I had all new drywall that was skim coated to a level 5 by the drywall contractor. I applied 1 coat of Gardz instead of a specific drywall primer or PVA, primarily based on positive opinion around here. This was used everywhere including the vaulted ceilings. I then lightly sanded the Gardz and...

What's the best way to remove or at least reduce a previously sandy-textured paint finish, to have the walls smoother, without replacing with wall board? Thanks in advance!

First for me, so I figured I would spray the first coat and then spray and back roll with a low nap roller on subsequent coats. Is this about right?