Thank you for posting your feedback regarding Tremco Vulkem 116 10.1 oz. Gray Exterior Polyurethane Sealant. As indicated on the Home Depot product page for this item: "Designed for exterior use". As indicated on the product package label: "FOR EXTERIOR USE ONLY. DO NOT USE INSINDE AN OCCUPIED BUILDING, EVEN IF THERE ARE NO OCCUPANTS PRESENT DURING USE." Should you have any additional questions or wish to discuss this with us, at your convenience, please feel free to reach out to Tremco Technical Services at 800-321-7906.