Dowsil 688 glass, metal, masonry and cladding sealant is a high performance, neutral cure silicone sealant designed for a wide range of glazing and weather sealing applications. It will bond to form a strong weatherproof seal on most common building materials.


  • Joint movement capability of (+/-25%)
  • Adheres to a wide range of building materials and finishes
  • Bonds to most common construction materials without use of primer
  • Neutral cure - will not corrode galvanized/zinc-coated steel or attack concrete
  • Excellent resistance to weathering, ultra-violet radiation, vibration, moisture, ozone, temperature extremes, airborne pollutants, cleaning detergents and many solvents
  • Long life reliability
  • Non-slumping - can be used in vertical and overhead joints
  • Easy to use - one part, no mixing required
  • Can be applied in any season
  • Excellent recovery from extension and compression


  • Adheres to glass, aluminium, brick, concrete, steel, ceramic, fibreglass, rubber, enamel and painted surfaces
  • Can be used on monolithic glass and pyrolytic coatings
  • Cladding/facade sealant
  • Window perimeter sealant


  • Some applications may require the use of a specific Dowsil primer
  • For more information on compatibility with other products and specialist advice, please contact Glasscorp directly
  • Customers should independently determine the suitability of this product for their specific purpose prior to use


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