I do not understand why everyone wants to spray . you get 1 small clog in the nozzle when you are even 10 foot away and you just sprayed the house or door . Now you have to clean the hose and pump. I go out with a factory 550 pro unit set up with spray ,and I broom 98% of the driveways. The only time I spray residential is when I have a long drive and dont start spraying till I am far away from buildings , the sprayed areas get 2 coats. I have gone thru 2200 gallons so far this month and havent sprayed yet. I just built a 200 gallon tank just for residential , small , light , can be pulled by a small truck. It has no spray capabilities , just a mixing tank with brooms . Get sealer all over a door , or on a house and watch your bottom end drop real quick . Been there in the learning process. if you realy want to learn the tricks of sealcoating dont experiment , go work for a company for 1 week , or go out and watch the some of the competition work .