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Any recommendation on the thickness of Plexi?
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I'd look for something in the 3/16" area. 1/8 is pretty thin and wobbly - although it might be OK for smaller frames. 1/4" is thick and heavy.
Personally, I'm not a big fan of plexiglass unless there is an absolute need for the safety factor. It scratches sooooo easily! It's almost impossible to clean without leaving ultrafine scratches that will show up as a sheen or haze when lit from above. Back-lit poster boxes may be less susceptible to this problem.
Plexiglas (a former trade name of Rohm and Haas for acrylic sheet) used to be
much more expensive than glass... although I think the costs have converged a bit. Recognize that there are two popular types of "plexiglas": acrylic (DuPont trade name Lucite) and polycarbonate (General Electric trade name Lexan). Acrylic is cheaper and a bit lighter; polycarbonate is ultra-tough and (I think) a bit less susceptible to scratching.