The cap sealant is a HAPS, non-sag sealant excellent for sealing around perimeters of windows, entry doors, compartment doors and joints made of bare or repainted materials. Compatible with Concrete/ Fiberglass And Other Fiber Reinforced Plastic/ Glass/ Masonry/ Rubber/ Thermoplastics. Ideally suited for aftermarket use. Paintable. Water resistant. Fast to dry and easy gunning. Cap Sealant Cure Times Vary. Manufacturers production date is located on the bottom of the tube. This is not an expiration date, it is PRODUCTION DATE. This product can last indefinitely as long as it is stored in a dry location and not extreme temps. Ideal temp storage between 55 to 85 degrees.