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Windscreen Sealants

Bostik 5615 is a synthetic rubber mastic compound, black in colour, which has been specifically formulated to remain permanently flexible in use. It is predominantly used in the automotive aftermarket area for secondary sealing of windscreens where a durable, skinning product is required.


  • Black
  • 520g cartridge
  • Rubber-installed gasket sealant
  • Non-curing flow grade butyl sealant
  • Permanently flexible
  • Non-corrosive
  • Non-oxidising
  • Non-staining
  • Excellent low temperature flexibility
  • Can be water-tested immediately after installation
  • A one part, ready to use sealant specifically designed for the repair and installation of windscreens and other automotive fixed glass
  • Remains a flexible bead with good adhesion to glass, butyl tape,and all metal surfaces
  • Provides excellent adhesion to both damp and dry surfaces


Designed for sealing of rubber to glass and rubber to metal on:

  • Car and bus windscreens
  • Rear screens
  • Quarter glass assemblies
  • Bus side windows
  • Boat windscreens
  • Ute canopy windows


  • Not designed for direct-bonded autoglass applications
  • Customers should independently determine the suitability of this product for their specific purpose prior to use


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