Kraken Bond Fastcoat Spray Foam Insulation is the most innovative, easy-to-use, polyurethane-based for high quality heat and sound insulation in the world. Kraken Bond Fastcoat Self Expanding Foam designed for professional workers, but it is also ideal for everyday users as well. The R-value measures the thermal resistance of a material. It's 5.66 per inch and thermal insulation value 0.025 W/(m.k). Can should be shaken very well before use. Apply the foam 12-18” distance from the wall at vertical applications. Spray the foam 6-8” distance from the ceiling for horizontal applications. Thicker application results in the higher insulation value. It is recommended to keep the can attached to the applicator gun if you wish to resume you application on a later date. NOT recommended to use with other brands. Moisten the surface lightly before application