... doors, unreachable areas around pipes, etc. It has good performances in anti-freezing, anti-moisture, noise-resistant and heat -insulation. Packages ... , there would be foam flowing out. 5. In a general way, just fill in the hole or gap by 70% when gun ... . Polyurethane foam sealants require some humidity in order to cure properly. For best results, apply in temperatures between 60-100°F (16-38 ...