Ok, finally got all the drywall up, and the first coat of mud is on there.. I sanded like a mother yesterday, ignoring most advice and using 150-220 grit on my random orbit sander, since like most amateurs, we put way too much mud on.
It really worked well and with the shop vac attached right to the dust port, there was hardly any dust hanging in the air.
The question I have is, how do I know how many coat I need to do? I hear 3, with the 3rd being a skim coat. Maybe some basics you could tell me like
How wide should I expect a tape joint to be feathered? How to determine if flat is flat enough? (i'm using a bright halogen on an angle to the wall to detect any shadows).