You would not use sandpaper. You would use a screen. The sanding screens usually come in an 80, 120, and 220 grit.
Sand is much heavier than grit. Sand should be used if you're trying to weigh something down.
Yes, definitely. You have to sand and then fill at least twice in most cases.
tape, float, sand, re-float, re-sand. . .then prime
40 Grit
Grit can be defined as particles of sand or dirt that is loose. Grit can also mean the strength of one's character.
grit, sand, gum
You may use a sander to smooth the surface of wood. You should sand against the grain of the wood, using. If you do not have an electric sander, you can use sand paper wrapped around a sanding block and do it by hand.
There should be no Liquid Nail residue on drywall . If there is a considerable quantity of it, it's easier to cut the board out and replace it .
you can put primer on scuffed surfaces. but really its a waste. if you scuff the paint with 320 grit sandpaper thats all you should need . unless you sand down to bare metal then you can hit it with primer
Seven parts washed grit sand to one part cement. The grit gives it it's strength. If you use building/plastering sand it will crack.
lightly wipe the drywall mud after it drys
I believe the lowset grit is 3, it looks like railroad rocks