3M Marine Adhesive Sealant 4000 UV is a multi-purpose adhesive sealant made specifically for marine applications that are exposed to UV rays. This medium-strength adhesive forms a tight, weather-resistant seal that still allows for disassembly. It's unique formula can be painted immediately after application. From there, this moisture-curing sealant forms a tack-free skin in 30-60 minutes. Ideal for use above and below the waterline, it reliably bonds dissimilar materials including wood, fiberglass, gelcoat, plastics, and metals. SMP sealants such as this form permanently flexible, elastomeric bonds that seal against the elements, maintain joint movement, and absorb stress caused by shock, vibration, swelling or shrinking. Between its strength, versatility, and superior UV resistance 3M Marine Adhesive Sealant 4000 UV is ready for demanding outdoor applications like sealing portholes, deck/hull fittings, rub rail attachment, screw holes, and stanchion supports.