PowerFoam is a one-part polyurethane expanding foam that sets and cures into its final form by reacting to moisture and humidity present in the air. PowerFoam's exceptional ability to bond allows it to be applied to various building elements including the surfaces of concrete, brick, block, wood, steel, aluminum and other miscellaneous metals. As it is being dispensed, PowerFoam has a neutral odor. Cured foam is standard yellow.