Join Date: Apr 2000
Location: Ottawa, Ontario, Canada
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I would recommend checking out KBK's ScreenGoo as well, his paints are meant to be used on projection screens. If you were going with a matt white screen, you could definitely use a more conventional brand of paint. However once you start looking at colour matching it becomes a a different story.
Unless the paint store you are using has a spectrophotometer (which I don't believe is generally the case) a colour match may not be good enough. What you really need is a ... "spectrum" match I guess is a good word. Because projector lamps have different spectral characteristics than incandescent bulbs you may find that once you put a colour matched paint in front of your projector it looks different than the reference.
Also, the Stewart Greyhawk has an optical coating that gives it a higher gain, and better ambient light rejection. That you won't be able to duplicate with a conventional paint.
Check out KBK's ScreenGoo, it won't be the same as a commercial grey screen, but it may work better than a colour match.