Seal your roof, flashing, skylights, chimney's with Flexible Seals Roof Sealant. This sealant is an elastomeric coated sealant that is graded for exterior use only. It is tack free in 30-60 minutes and resists water, UV ray, mildew, and fungus. Flexible Seal can be used in place of wet patch cement. Available in different color options, Flexible Seal will seal between dissimilar surfaces on seams, flashing, drains, vents, gravel guards, or where openings have been created due to aging.