Ok so here is an update; I've got my movie screen all set up and the projector working, I've been using it for about two weeks now just playing with options and testing some things. I ordered o variety of fablic from spandex house to test as I was hoping to get a black screen working for a better image the results are as fallows:
I opened up my shipment and quickly was able to discover what I had hopes of promising results and what I didn't think would prove fruitful; innitially as Mississippi Man suggested I put up the Gunmetal Gray/.White two face matterial with the white facing the audience, I used that for a day or two then I had ordered this very fine material which is almost like a netting or nylons that woman would wear it's black so I figured most light would pass through this and hit the white screen and reflect back to the eye rather than get absorbed by the black matterial but there should be enough black that it will create a truer black.
I used that on the screen for about a week or so and then decided to take it off and wash my screen matterial as there were some odd reflective sparkles here and there and some other artifacts. I fallowed the spandex house's directions for washing and then hung the matterial to dry. After that process I decided to remount the two face with Gunmetal Gray faciing the audience; I have put up a backer behind the screen as even with two matterial layers the screen is still transparent and in some areas I can see the supports at the back during dark scenes. Also in my order I found some stretchable sport matterial I also ordered in black; this is like a hockey jersey matterial but not the close knit type it has larger holes for breathing; I used this first on the frame to back it and stop the light then I stretched the two face. I found that the very fine/lightweight mesh matterial was a huge complication to stretch over the screen, you must get it 100% tentioned evenly or it will form patterns and swirls over your image which are very noticeable.
The light mesh will also not sit flat on the two face so if you don't tention it properly you will get ghosting in your image. I have been watching on just the gray side the last week and I'm still not satisfied; the gray doesn't see to bad; Black IS NOT Black... but asside from that the worst part about it is this matterial it's self is not perfect; it has HOT spots on the matterial and weird patterns almost like certain areas are wet and yet they are not; I'm planning on washing it again but don't image it will improve anything I think it's just cheap matterial it really takes the viewer out of the film as you get distracted from the scene with these glaring areas.
As for adding layers to screen and using black matterial I have found that you can project an image onto a black surface; however it's not the surface that is the problem it's the projector. Allow me to explain as I am typing this posting I'm viewing my window projected onto the gray screen; the image is corrected with my warping software and color corrected with data color (adjusting lumens, reading ambient light, color correction along with Black and White settings) all are within range. Since my projector (Benq W710ST - Short Throw - ) is mounted on the cieling pointed down close to the screen (all close to spec) and keystone corrected manually there is a bow in the projected image especially since my screen is curved but not calculated precicely like a cinema screen.
You can image this bow to create a 'smiling mouth' like shape under my "Windows window" of which is projected image but not used just.... well 'black'; however below that is still a few inches of unprojected screen matterial (Gray) however when looking at the screen I see a mostly white window (the forum) then my task bar then the washed out black/ gray looking 'smiling mouth' and then the screen which looks black. Above my screen is a similar picture there is over projected area which is unused and then some dark unprojected screen area and then black velvet I attached to the cieling; the black unprojected screen almost matches the black velvet but the washed out projected area is not even close.
This tells me that in order to get an actually black image you'd have to have a projector that didn't project any area that was black as it is the light that ruins this image.
I have also abandoned multi layers for screen matterial since my screen "floats" in the air with guy wires 5 feet off the ground it is far too challenging and tedius to attached multiple layers of screen matterial just to try out to see what is the best to use.
Needless to say I am very dissapointed with my purchase and will be looking for new screen matterial; R&R is expensive teedius work, I've just wasted $250 (+ S&H to Canada) on screen matterial which is of no use; if any one has any better matterial please let me know; thank you.