How To Use Progressive Web App aka PWA On 420 Magazine Forum
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'glassboard' -- it is made in 'brilliant white' is glossy, pebbled finish for excellent light reflection from & too all angles. This is the stuff that now covers the walls of commercial kitchens $25.00 for a 4'X8' sheet at Home Depot. go to Home Depot w/ all your measurements & they'll cut it for you too.
^^It actually absorbs light, not to mention hotspots. . .
Bagz
Mylar all the way! Get the 2 millimeter stuff the 1 millimeter rips too easily and is hard to work with. The 1 mil. is not useful for anything but covering a perfectly flat wall. Second best choice would be to paint the walls with flat white paint or cover them in "panda poly" (white on one side, black on the other.) Personally, I use mylar.