DOWSIL™ Contractors Weatherproofing Sealant

A one-part, moisture cure, medium modulus sealant that provides durable, flexible, watertight joints and offers outstanding unprimed adhesion to most non-porous substrates. It is specifically developed for sealing dynamically moving joints.


  • Dynamically moving joints such as expansion and control joints
  • Concrete panel joints
  • Tilt-up panel joints
  • Curtainwall joints
  • Frame-to-structure and perimeter caulking of windows, doors, panels, EIFS, bedding of mullions, panels and frames, etc.


  • Primerless on EIFS and most common nonporous building substrates, including glass and aluminum
  • Balanced adhesive strength, medium modulus and high recovery
  • Excellent all-weather gunnability and performance
  • Extension/compression capability of ±25 to ±40 percent
  • Available in 10.3 ounce cartridges, 20 ounce sausages and two gallon pails
  • Choose from 20 standard colors, 19 special colors and custom colors, too
  • 5 Year Weatherseal Limited Warranty


These values are typical properties and are not intended for use in preparing specifications.

  • Adhesion to Yes No Alodine Aluminum, Aluminum, Anodized Aluminum, Brickwork, Ceramic, Concrete, Enamelled and Reflective Glass, Extruded Mill Finish, Fluorocarbon Coated Aluminum, Glass, Granite, Heat Strengthened Glass, Light-Weight Stone Panels, Limestone, Low E Coated Glass, Marble, Masonry, Metal, Metal Panels, Paint, Plastic, Polyester Powder Coated Aluminum/Steel, Stainless Steel, Steel, Stone, Vinyl/PVC-U, Wood
  • Appearance Yes No Opaque
  • Application Temperature Range Yes No -29 to 49 °C
  • Chemistry Yes No Neutral
  • Color Yes No Aluminum, Anodized Aluminum, Antique White, Black, Bronze, Buff, Charcoal Gray, Custom, Geographic Beige, Grey, Ivory, Light Bronze, Limestone, Mountain Fog, Off-White, Precast White, Redwood Tan, Sandlewood, Sandstone, White, Window Bronze
  • Cure System Yes No 1-Part Cure
  • Cure Type Yes No Neutral Cure
  • Durometer - Shore A Yes No 20 to 30 Shore A
  • Elongation Yes No 550 %
  • Flow Yes No NonSag
  • Movement Yes No Medium
  • Movement Capability Yes No -40 to 40 %
  • Number of Parts Yes No One
  • Peel Strength Yes No 20 to 28 ppi
  • Primerless Adhesion Yes No Primerless
  • Resistance Type Yes No Ozone Resistance, Thermal Resistance, UV Resistance, Water Resistance
  • Room Temperature Cure - Hours Yes No 168 to 336 Hours
  • Service Temperature High Yes No 121 °C
  • Service Temperature Low Yes No -40 °C
  • Shelf Life Yes No 540 Days
  • Substrate Yes No Porous
  • Tack-Free Time-50% RH Yes No 360 Minutes
  • Tensile Strength Yes No 180 psi
  • Volatile Organic Content Yes No 35 g/liter
  • Where Used Yes No Job Site
Office building with blue sky

No-compromise silicone sealing

This versatile, one-part 100% silicone sealant delivers outstanding life-cycle value and lower installed costs at a price that is competitive in the market. Virtually unaffected by ultraviolet (UV) light and weather extremes, DOWSIL™ Contractors Weatherproofing Sealant provides all-weather application and performance.

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DOWSIL™ Contractors Weatherproofing Sealant
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DOWSIL™ Contractors Weatherproofing Sealant

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DOWSIL™ Contractors Weatherproofing Sealant
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