Liquid Urethane Foam Kits, Manufactured by Fiberglass Coatings Inc. (FGCI), 4 Pound Density, Includes 1 Gallon of Part A and 1 Gallon of Part B, Excellent for Flotation or Insulation. 2 Gallon kit makes 4 Cu Ft of foam. The urethane based resins, when mixed, create a permant foam with closed cells, filled primarily with CO2. If foam is poured in an enclosed area, vent holes are normally required to vent excess foam., otherwise, pressures may distort structures. Why use 4 Lb density instead of 2 Lb density? One area is fuel tank placement in vessels. Often 4 lb. is used instead of 2 lb to make sure tanks are held in position in rough seas.
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