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Foam fillers are typically polyurethane polymers that expand when exposed or discharged from their spray cans. These fillers are applied in crevices and expand twice their volume. The dried excess foam may be cut, sanded, and painted to suit various applications. Foam fillers are widely used to fill cavities and seal openings in construction activities such as window and door installations. Similarly, they create a sound-absorbing layer that is also good thermal insulation when applied to walls and roofing.

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