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How quickly does a SPF spray polyurethane foam roof become watertight and able to withstand foot traffic?

April 26, 2017able foam foot polyurethane quickly roof SPF spray watertight withstand

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How quickly does a SPF spray polyurethane foam roof become watertight and able to withstand foot traffic?

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SPF roofs and walls are watertight within 10 seconds of being applied to a dry clean surface. They are able to bear foot traffic within 30 seconds of being applied.