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DOWSIL 1200 OS Primer is an air drying primer supplied as a dilute solution of moisture reactive materials in volatile siloxane and is used to improve both the quality and speed of adhesion development to room temperature vulcanizing silicone sealants to a variety of common non-porous substrates.



Product Data 




  • Useful for both moisture curing RTV and heat curing silicones
  • Diluted in low molecular weight silicone fluid
  • Meets many international regulations for low VOC content (including European Union)
  • Similar to P5200 Primer


  • Useful on most metals, glass, ceramics, masonry, wood, fabric and some plastics (including FR-4)

Potential Uses

  • Enhances bonding/adhesion of RTV and heat cure silicones to many:
  • Metals
  • Ceramics
  • Glass
  • Wood
  • Masonry
  • Structural plastics

Application Methods

  • Apply in a very light, even coat by:
  • Wiping
  • Dipping
  • Spraying
  • Excess material should be wiped off to avoid over-application
  • Diluting by a factor of 2 to 4 with additional solvent may avoid excessive build-up

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