Here in Middle Tennessee, we have alot of exposed aggregate. My neighbor saw me sealing my aggregate the other day and noticed how good it looked when I finished. She offered me the opportunity to seal her aggregate driveway, sidewalk, and porches. My cost on commercial grade aggregate sealer is $50.00 per 5 gallon bucket. It took me 1 1/2 hours to apply my 10 gallons to my property with 1" nap roller and 4 ft. handle - EASY work IMO. My question is this - how do I charge concerning labor? By the sq. foot or by the hour? Any suggestions?