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Handi-Foam? Quick Cure E-84 (Class 1) spray foam is commonly used for sealing and insulating Rim/Band Joists, Bacement Walls, Foundation Walls and areas where the foam will be left exposed. Other uses include: insulating metal buildings, marine applications, and stage props. Quick Cure E-84 is a medium density (1.75 lb) foam that cures to fairly rigid in several minutes. It can be sanded and painted if desired. It is dispensed using the patented Handi-Gun? dispensing unit for accurate and precise applications.