To apply latex over oilbased paint, clean the door thoroughly. Use 150grit sandpaper to sand all the rough spots Image 1. Follow with 220grit sandpaper to sand. TeXworks-600.jpg' alt='Latex For Windows 7' title='Latex For Windows 7' />How to Paint Over Oil Based Paint with Latex Paint how tos. Test the Paint. Before painting an old door, its important to determine if the original paint is oil based or latex latex paint will not adhere to oil based paint unless certain preparatory work is done. Soak a clean rag in denatured alcohol and rub the surface of the door. If the paint starts to soften, it is latex. Little Britain Ita. If it doesnt, the paint is oil based. This door is oil based. Z6FZWd0/T1eU1z_dyTI/AAAAAAAADfg/aReNtHIKOzE/s1600/2.png' alt='Latex For Windows 7' title='Latex For Windows 7' />How can I change the Windows language from Spanish to English in a Windows 7 Professional Please note that this is not Enterprise or Ultimate version.