An unbelievable three years have gone by and I still project onto my Stewart nine foot screen using no masking. I know I am losing picture quality. The screen never goes up and down, so applying material directly to the screen won't be a problem. What would be the most effective (and least crude!) way to apply masking material to the top, bottom, and sides of this tensioned screen? Also, what is the best material for the buck and what will best support the material to avoid sagging. The screen will have to support the weight of the material and I would need to move the masking for different ratios. Thanks for your help....especially since my wife offered to make this for me as a Xmas present!!