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Quick curing, 2 pound density foam used for flotation, insulating and filling. Must be mixed 1:1 equal parts. Foam expansion rate is approximately 25:1. Calculate the size of the cavity to be filled to determine the amount of foam needed. Cavity Size Foam Required1 quart (57.75 cu. in.) 1.3 fl. oz.1 gallon (231 cu. in.) 5.2 fl. oz.7.48 gallons (1 cu. ft.) 38.2 fl. oz.