The company I hired did a great job. it smells very strong when being applied, then afterwards smells like a freshly painted room.It dries and cures almost instantly you must wear protective clothing, mask, with goggles. Because it Catylizes with moisture so it would glaze over your eyes if you watch while sweating. The whole room took about 1/2 hour to spray and most of the labor is from masking and cleanup.which was another 1.5 Initially I was going to use the fiberglass insulation but this has double the R value of that and seals better, and with Obama giving a 30% energy saving tax incentive it put me in the ball park of where it was better affordable.