If you're looking for a quality highly lambertian diffuse white coating for your projector screen, you should check out Labsphere's diffuse white coatings. It reflects 98% of light and lacks the artificial brightness created through the fluorescence of the titanium dioxide.
http://www.labsphere.com/productdetail.aspx?id=504
Slashdot Mirror
If you're looking for a quality highly lambertian diffuse white coating for your projector screen, you should check out Labsphere's diffuse white coatings. It reflects 98% of light and lacks the artificial brightness created through the fluorescence of the titanium dioxide. http://www.labsphere.com/productdetail.aspx?id=504