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BOSS® 388 neutral weatherproofing silicone sealant is a one-part, neutral cure, low-odour, construction-grade sealant that offers excellent adhesion, weather-resistance, and compatibility with a wide variety of materials.



This product is available in clear, white, black, grey, and bronze.



Available in 280 ml cartridges.



  • Excellent adhesion to most common building materials.
  • Low-odour.
  • Non-corrosive to metal.
  • Weatherproof and waterproof.


  • Ideally suited for weatherproofing, waterproofing, sealing, and expansion of control joints and general-purpose glazing.
  • Other bondable surfaces include ACP, anodized aluminium, cement, wood, ceramics, painted surface, and many plastics.
  • Works well with glass, glazed surfaces, concrete, and galvanized steel.

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