smooth-on foam-it!3 pourable rigid foam 1.9 lbs smooth-on smooth-on’s foam-it! series are two-component water blown rigid foams that are versatile and easy to use. parts a and b are measured and mixed in equal amounts by volume. the mixture is then poured into a mold or other form (apply release agent if necessary). the mixture will expand many times original volume (depending on which foam-it! product you are using) and develop a uniform cell structure. c all foam-it! products can be used as a straight casting material, backfill material for hollow castings (adds structural strength) or as an encapsulation material, etc. they can be color pigmented with so-strong, uvo or ignite colorants and are used for a variety of art/ craft, industrial design and special effects applications.