BOSS 389+ Silicone Weather Sealant – Premium Weatherproof Sealant in Sri Lanka

The BOSS 389+ Silicone Weather Sealant is a premium-grade, weatherproof sealing solution engineered for superior performance in demanding construction, glazing, and maintenance applications. Available in black silicone sealant and white silicone sealant finishes, it combines functional reliability with aesthetic versatility, making it perfect for a wide range of building and home improvement projects in Sri Lanka.

Packaged in a convenient 290ML cartridge, this neutral cure silicone sealant is easy to apply and delivers professional results for both contractors and DIY projects. Designed for compatibility with all structural silicone sealants, the BOSS 389+ is ideal for expansion joint sealing, repair work, new installations, and combined applications.

Its neutral cure formulation minimizes the risk of corrosion, making it safe for use on multiple surfaces such as anodized aluminium, concrete, cement, wood, ceramics, painted surfaces, ACP (Aluminium Composite Panels), glass, glazed surfaces, and galvanized steel.

With exceptional weatherproofing and waterproofing capabilities, the BOSS 389+ withstands Sri Lanka’s tropical climate, offering long-lasting durability in both extreme heat and heavy rain. Its medium modulus formula accommodates up to ±25% joint movement, ensuring the seal remains intact even with building expansion and contraction.

The sealant remains permanently elastic after curing, preventing cracks and maintaining airtight, watertight protection. Its extended open time provides flexibility during application—perfect for large-scale projects or intricate sealing work.

This silicone sealant in Sri Lanka is the go-to choice for:

• Glazing applications (windows, doors, glass-to-metal joints)

• Curtain walls and façades

• Expansion and control joints

• General-purpose sealing in residential, commercial, and industrial projects

In summary, the BOSS 389+ Silicone Weather Sealant offers unmatched durability, flexibility, and compatibility—ideal for architects, contractors, and homeowners seeking a high-performance, long-lasting silicone sealant in Sri Lanka that delivers a professional finish every time.

• Name: Silicone Weather Sealant BOSS 389+
• Available Color: Black and White
• Brand: BOSS
• Model Number: 389+
• Packaging: 290ML
• Compatible with all structural silicone sealant.
• Good weather and temperature resistance.
• Medium modulus – with expansion/compression capability up to ± 25% of the original joint width.
• Neutral cure, with a long open time.
• Permanently elastic after curing.
• Ideally suited for weatherproofing, waterproofing, sealing of expansion and control joints, and general-purpose glazing.
• Other bondable surfaces include anodized aluminium, concrete, cement, wood, ceramics, and painted surfaces.
• Works well with ACP, glass, glazed surfaces, and galvanized steel.