GreatSeal is a line of single component construction sealants designed for use on roofing, doors & windows, masonry, and siding. These premium sealants are 100% solids, no solvents low VOC's and is specially formulated for application in damp, dry or cold job-site conditions at temperatures down to 40 degrees F. GreatSeal sealants adhere to the majority of construction surfaces without the need for a primer.