i have a lawn company, and had a commercial customer ask me about re-striping the parking lot. he said there are no local companys around that do this.i guess he had a hard time finding someone, since its a small lot. so, im thinking, no competition=$$$$$$, right? but i have never done striping before. can i use a 4" roller, and just do it by hand since its a small lot? how do i charge? are the pump up sprayers any good? any advice would be helpful. thanks.