Not sure what I wiped it down with. Probably lacquer thinner. No Ospho. I think it was about a week between the DP90, and the Slick Sand. Possible the DP was a bad mix, since I used the rest of the Slick Sand on other projects, without any issues. I like Slick sand. It's like spray bondo. Even smells like it. Hard like a rock when dry. Sands like butter. I'm just trying to help by relating what happened to me.