I just made a screen this past weekend for my Sony 10HT. I used Glidden interior flat white and mixed a little Glidden flat black. I experimented with different shades and ended up with a shade a little darker then 'Snowfield' and a little lighter then 'Veil'...it is close to 'Universal Gray'. I looked at having Home Depot mix Universal Gray for me, however I did not like the fact that the mix called for some red and yellow pigments. So I decided to mix my own. The other advantage, other then being able to experiment, is I can still use the white and black for other projects. The screen came out real nice and the image looks great with improved blacks and the whites are still clean and bright. I don't know what the final gain value is however.