SikaFlex -221 Multi-purpose Side Wall Sealant – 10.1 fl.oz. – Aluminum/GreySikaflex-221 is a professional-grade, one-component polyurethane adhesive and sealant designed to create strong, flexible, and long-lasting bonds across a wide range of materials. Trusted throughout the RV, automotive, marine, and industrial industries, and commonly used in RV awning installations, it delivers reliable performance for sealing joints, bonding components, and protecting against moisture and weather exposure. Its moisture-curing formula forms a durable, elastic seal that resists aging, vibration, and harsh environmental conditions. Once cured, it can be sanded and painted for a clean, professional finish.Wide Substrate Compatibility: Bonds effectively to metals, painted and primed surfaces, ceramics, and many plastics for versatile sealing and bonding applications.Permanent Elastic Sealing: Creates a durable, flexible seal that accommodates movement while resist