I dont spray it, I also brush it on. I use the Parma stuff but it is identical in every way to BD. one thing that is important to put the stuff on with a clean brush. The only way that i have been able to clean a brush with this crap on it is to soak it in nitro. I know it sounds crazy but it works. rinse the brush off, get all the wet mask and stuff out then just drop it in a glass or jar filled with 30% nitro and voiala. make sure to thoroughly rinse out the brush again when taking it out. I do this in between every coat and it seems like less mask gets wasted