AVS Special Member
Join Date: Jul 2001
Location: Floyds Knobs, IN, USA
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In the USA, white blackout cloth works well. Bright white cloth with vinyl backing to block out light (originally designed for windows behind drapes or to be sewn to the back of drapery to block out sun light and give more privacy). It's cheap ($4-5/yd USD for 54" width) and easily found in local fabric shop. In Europe, I'm not sure but you may ask your local fabric or art stores.
Some people use drywall or sheetrock to paint/make their screen as it does not warp like plywood, thin MDF, or formica.