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I was trying to source you a composite sheet we used in 1/4 miler car.
It is also common material for sign shops as it has good strength, machinable, and comes prepainted.
It is black synthetic rubber sandwiched between aluminum. Very strong and durable compared to other sheet materials.1/4" thick is strong like 5/8 plywood but 1/16th weight. But alas Ive failed hope someone reads this and puzzles it together really excellent stuff 4x8 sheets.
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