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The tank was then put in place so that the urethane and micro could shape themselves to the bottom of the tank

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The filtering funnel keeps crap out of the fuel tank

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Here I have annotated the important elements. The red outlines the fiberglass support bonded to the bottom of the tank. Blue arrow points to the blue crack. The crack formed exactly as a stress analysis says it should, at 45º to the corner of that supp