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Testing Flame Guard intumescent fire retardant clear coat on a small rubber tire. Rubber mulch is frequently used as a backstop in gun ranges, and small fire caused by bullets hitting residual metal threads can start a fire. or else someone can fire a tracer round. This is a small bench test on a tire with two coats of Flame Guard. It does a great job! For more info, go to shop.rdrtechnologies.com