That is a very good point to not paint lexan. Generally plastics dose not like to be sprayed with solvents(which spray paint is). They tend to weaken them by eating little holes in them. Thus, as you know, they become weak and brittle. 1/4" Lexan is about the weakest lexan you can find. The lexan used in the demo was most likly of 3/4" to 1" thick lexan.
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