I'm constructing a poured concrete retaining wall and I've completed the footing and am now building forms for the wall. The forms are plywood and I want them to come off easily after the concrete is poured. People around here usually use diesel. However, I'd also like to "fill in" some of the roughness of the plywood, so the finish on the wall is smoother. I was wondering if, say, a cheap latex paint might work as a form release agent. If not, any other suggestions? Thanks.