BOSS 322 100% RTV silicone sealant is a paste-like, one-component material that cures to a tough, rubbery solid when exposed to moisture in the air. Since it will not flow under its own weight, this sealant can be applied overhead or on sidewall joints and surfaces without sagging, slumping, or running off. It will adhere to clean metal, glass, most types of wood, silicone resin, vulcanized silicone rubber, ceramic, natural and synthetic fibre, as well as painted and many plastic surfaces.

Silicone Sealant “Boss” 322 is a premium-grade, versatile sealing and bonding solution designed to meet the needs of both professional and DIY applications. Available in four classic colors—Clear, White, Black, and Grey—it offers an attractive, long-lasting finish that blends seamlessly with a wide range of surfaces and projects.

Formulated with excellent adhesion to most common substrates, Boss 322 provides a secure and durable bond on materials including metal, glass, ceramics, wood, plastics, and more. Its superior resistance to weathering, vibration, moisture, ozone, and extreme temperatures ensures performance and reliability even in the harshest indoor or outdoor environments. Whether exposed to blazing sun, heavy rain, or freezing cold, this sealant maintains its integrity without cracking, shrinking, or becoming brittle.

One of its standout features is its ability to be applied in sub-zero conditions without compromising extrusion or physical properties—making it ideal for all-season use. The non-sagging and non-slumping formula allows precise application on vertical and overhead surfaces without messy drips or uneven coverage.

Boss 322 is the go-to choice for a variety of demanding applications, including:

• Adhering auto and appliance trims, including metal, fabric, and fabric-backed plastics.

• Bonding gaskets in heating, ventilation, refrigeration, and cooling units.

• Bonding signs and sign letters for both indoor and outdoor displays.

• Serving as a construction sealant for sealing expansion joints, gaps, and structural connections.

• Filleting and caulking joints in sheet metal stacks, ductwork, and equipment housings.

• Acting as a formed-in-place gasket for gearboxes, compressors, and pumps.

• Providing reliable glazing for windows, doors, and glass panels.

• Name: Silicone Sealant Boss 322
• Available Color: Clear, White, Black and Grey
• Brand: BOSS
• Model Number: 322
• Packaging: 300g
• Skinning Time: 8 to15 min
• Excellent adhesion to most common substrates.
• Good resistance to weathering, vibration, moisture, ozone, and extreme temperatures.
• Non-sagging, non-slumping
• Adhering auto and appliance trim, including metal, fabric, and fabric-backed plastics.
• Bonding gaskets in heating and refrigeration units.
• Bonding signs and sign letters.
• Construction sealant.
• Filleting and caulking joints in sheet metal stacks, ductwork, and equipment housings.
• Glazing sealant.