Dry wall finishing done right should only need sanding on the final coat.
After the first and second coat just drag the drywall knife over the seam to knock off the high spots.
Your trying to build it up, why sand it off to just reapply more compound?
yup no sand just scrap, when you do come to sanding i use a broom and brush the walls and take a dry paint brush to get in the corners and tight spots. then shop vac the floor. then put a damp rag on a pole and do a quick once over on the walls again.
drywall dust is nasty, Sometimes I will prefer to do a 4th coat and zero sanding... depends on surroundings.
Sometime I do 2 heavy coats and sand.
Also depends on what texture is being applied, but always avoid sanding as much as possible.
in homes i set up a containment with plastic on the floors and plastic on the walls that arent being worked on. plastic off hvac and doorways. i set up an air scrubber. i sand roll up the plastic and toss the dust in the trash.
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