I have a job coming up for blasting 20,000 sq ft of bare concrete for a Ross that is being put in at an old sears building. they want a profile for painting. does anybody have experience in dry blasting indoors? Im worried about how much dust this will cause, how much media I will use & how much clean up will be involved.... I am planning on using 80 grit Garnet, I ordered 4 super sacks. and my set up is a sullair 375HAF with a 600 lb pot.