Closed cell spray foam is made by mixing two chemicals. Each chemicaltravelsdown a separate hose and are mixed together as they are sprayed out of a gun at about1100-1200 psi. The chemicals need ...

and spray until the gun is clean. You can also buy cans of urethane adhesive and use the gun to apply it. A serrated knife with a flexible blade is perfect for cutting off excess foam. Just make ...