We have an old sleeping porch with 12 double hung wood stained windows. I want to paint them because there has been some water staining on them and because I like the look. Anyway, I am not sure of the best technique to paint. If I remove them and paint all sides I am afraid that the extra paint will make the windows fit too tight to open. If I paint them in place they have a chance of sticking. So, what should I do?