I have a gallon of X-O Rust enamel oil base from True Value. It was a neutral base tinted to match my blue 40. I stripped down a window frame to bare metal due to minor rust issues. Now I cant get the paint to lay right. I get lite and dark colors and when I paint the edges the color runs off. I mixed it 50 50 with MS. It is not laying down like Rust Oleum does. What am I'm doing wrong? I might have to strip it off and try to find Rust Oleum in my color. Not easy to do in So. Cal. Maybe this can help other $50 painter. Any advice will do.