3M™ Fast 'N Firm Seam Sealer is a fast-setting seam sealer designed for sealing exterior joints and seams. It adheres well to both clean and coated metal, and is tack-free in as little as 25 minutes. A heavy-bodied, high-solid formula prevents sagging and shrinkage along both vertical and horizontal seams including door hem flanges, exterior seams/joints, and overlapping sheet metal. If saving time and boosting productivity are important, 3M™ Fast 'N Firm Seam Sealer is an ideal choice.