Liquid Urethane Foam Kits, Manufactured by Fiberglass Coatings Inc. (FGCI), 2 Pound Density, Includes 1 Quart of Part A and 1 Quart of Part B, Excellent for Flotation or Insulation. 2 quart kit makes 2 Cu Ft of foam with approximate R value of 7, for each Inch of thickness.  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