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Nice article; wish I'd had this info on paint comparisons a long time ago. I did much the same thing a number of years ago, but to get a perfectly flat, smooth surface, I used a 4x8 sheet of 3/4" MDF, cut down to be perfectly 16x9 format (ended up 49x87.1, screen size 99.8"). Yeah, it was heavy, but stiff, and my wall had all kinds of drywall waves in it. Used Behr UltraPure White flat to avoid hotspots, and painted it while laying it flat on sawhorses. Used 1x4 MDF trim for the frame, painted flat black and mounted the bottom one to studs first, using a level. Then set the bottom of the MDF screen on top of the bottom frame, tilted the screen up and fastened it to the wall with a dozen screws around the perimeter. Easy to cover the screw heads. Finished putting up the remaining black frame pieces, and the effect was stunning, both to guests walking into the room and while watching anything. Biggest learning was to ratchet back on my OCD, relax about being a few degrees off on color temp, and enjoy a cheap DIY screen that cost me about $55. Once you get into a movie, your brain will compensate for most imperfections, and you'll completely forget all about them unless you're calibrating or specifically trying to be critical. If I had to do it again, I'd definitely use the Sherwin-Williams ProClassic Smooth mentioned above, but otherwise, I've been more than happy with my screen through two projectors (540p, then 720p) and soon-to-be a third in 1080p.
BenQ