Make sure the surfaces that are to be sealed are clean., It takes just minutes to apply Green Glue Noise proofing Sealant along edges and cracks. It dries completely in 48 hours., Green Glue Noise proofing Sealant has been independently tested by Underwriters Laboratories for fire safety and environmental impact., Green Glue Noise proofing Sealant seals the cracks and gaps to prevent unwanted noise from escaping a room, It is non-hazardous, has practically no door, and it resists drying out or cracking with age