DOWSIL™ 781 Multi-use Acetoxy Silicone Sealant


DOWSIL™ 781 is a one part silicone which offers fast cure and excellent adhesion to most non-porous surfaces including aluminium, glass and painted surfaces.

Product info


  • Fast cure - tack free in 30 minutes
  • Working time of 5-10 minutes
  • Joint movement capability +/- 20%
  • Conforms to ISO 11600-F&G-20LM
  • Resistant to ozone, ultra-violet radiation and temperature extremes
  • High strength

Substrate Type

  • Aluminium
  • Glass
  • Toughened Glass
  • Ceramic Tile
  • Anodised Aluminium
  • Formica
  • Timber
  • Painted Timber








Technical Information

Where to use Interior/Exterior
Paintable No
Skin Overtime 2 hours
Time to cure 24 hours
Time to cure disclaimer Sealant cure rate is 3mm per 24 hours
Container Type Cartridge
Shelf life 2 years
Sizes 310 ml
Application method Sealant Gun and Cartridge


Surface Preparation

Ensure that surfaces to be sealed are clean, dry, sound and free from frost, release agents, old sealants and other contaminants which could impair adhesion. All surfaces should be cleaned and degreased by wiping with a suitable solvent such as DOWSIL™ R-40 Universal Cleaner on a clean oil and lint free cloth before application of sealant.

Application Instructions

Apply sealant to the desired area using a sealant gun. Once finished, the joint should be tooled within 5 minutes of application to ensure good adhesion. For an extensive list of application methods, please consult the Technical Data Sheet.

Clean up

Excess sealant may be cleaned off tools and non-porous surfaces whilst in an uncured state using DOWSIL™ R-40 Universal Cleaner. If sealant is misapplied to porous substrates, it should be left until it is just cured and then removed by peeling, cutting or other mechanical means. Care should be taken not to damage plastic or coated surfaces.

Quantity Estimator

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