3M™ Strip-Calk is a soft butyl rubber caulking material that quickly and permanently fills all types of seams, joints, and openings. Simply thumb one-foot lengths into place — without the need for spraying or tools — and smooth it with a finger. Strip-Calk is paintable immediately and never hardens, shrinks, or becomes brittle, helping to eliminate rework in the future. Thanks to fuss-free application and permanent flexibility, 3M™ Strip-Calk helps you perform long-lasting auto body maintenance and repair with ease.