I honestly don't know. We were painting the whole thing so just poured the OSPHO on, let it sit, and then painted over it again. It sorta ran down the sides over the windows on the dressing room and left a streaky look (that I have yet to sit down and see if I can get it off) but otherwise it did a great job

"The surest sign that intelligent life exists elsewhere in the universe is that they haven't tried to contact us yet."