Fomo Products. Designed to improve energy efficiency by stopping air infiltration, Handi-Foam spray polyurethane foam is used to coat and cover seams and small holes in the perimeter of stud wall cavities, augmenting primary insulation. Properly applied, the foam sprays out in a bead that allows fiberglass insulation to fit behind it without crushing the batt into the cavity. 800.321.5585.