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The lexan that was spray painted and shattered was 1/4" thick this is important. Lets say that the paint eat away at the 1/16" deep(very conservative estimate) on all painted sides that leaves 1/8" of untainted material left to hold up to an impact. since the imapct was on there goal grabber forklift and it most likly was nt supported except on the end and it was probably over 10" long that leaves an 1/8" thick 10" long piece of unsupported lexan collideing on edge with an unforgiving piece of metal(most likly). Shattering sounds like the logical solution.
If you want to make your forklift visible I would have used a bright shinging tape. Like a neon yellow tape or what ever would match your bots color scheme.
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