The use of the petroleum jelly is critical. Without it the gun would rapidly become non-functional. Illustrated here is a used nozzle with the spray foam curing in it. The tube contains about 4 squirts of petroleum jelly.
Spray Foam, Petroleum Jelly and Nozzles
The use of the petroleum jelly is critical. Without it the gun would rapidly become non-functional. Illustrated here is a used nozzle with the spray foam curing in it. The tube contains about 4 squirts of petroleum jelly.