Projector screen colour?

Hi guysI am experimenting to try and get the most out of my Dell 3300Mp lcd projector.Daylight scenes are fine but night scenes lack the darkness due to light from the bulb shining through and creating a greyish eefect.My question is has anybody used a silver paint for there screen like the professional screens and if so what were the results like? I am hoping to get the night scenes much darker with better contrast for things that are lit eg runway lights etccheers keith