If 55 gal will cover 80sqft X 55=4400 sqft and it cost $35 a gal,, thats a mrkup of $405 per barrel at 10cents a sqft. Not bad money. I am just wonder tho, how often do you have to sealcoat a drive or parking lot to keep it looking good. If i was to get every parking lot in my community, I still dont know if I could make such a business work. If the product last for several years, I would soon run out of work or have to start traveling farther just to stay in business. What do you use to remove the oilspots in parking lots?