I have double-hung windows that are stained. I want to paint them. However, when I painted the double-hungs in my last house the latex paint bonded the top sash and bottom sash together where they meet. (Yes, they were very dry when I put them back in.) The two sashes bonded so well that it tore some of the wood out when I finally was able to break the bond. Does anyone know how to paint double-hung windows so that two sashes donít bond together?