What sort of equipment do you use to go through 1000 gallons shellac? I'm picturing a big pneumatic pumps pulling out of drums, graco king or similar, and a fresh air supplied full hood.I think it depends upon the logistics more than the actual surface area really. If it's a confined space, full face is obviously preferred. If you're spraying overhead a lot, that will add a fair amount of suck as well. We didn't even have doors on the units and the buildings themselves were tented, so I used half face, roughly 3-4 sets of organic filter changes per day. Over 1,000 gallons of shellac. I'm getting sick just thinking about it.