DOWSIL™ Contractors Weatherproofing Sealant 10.3oz Cartridge


A one-part, moisture-curing, medium modulus sealant designed to create durable, flexible, and watertight joints. This sealant offers exceptional unprimed adhesion to most non-porous substrates and is tailored for sealing dynamically moving joints.

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Technical Data Sheet

Color Chart


  • Designed for dynamically moving joints like expansion and control joints.
  • Ideal for sealing concrete panel joints, tilt-up panel joints, and curtainwall joints.
  • Suitable for frame-to-structure and perimeter caulking of windows, doors, panels, and EIFS, as well as bedding of mullions, panels, and frames.


  • Requires no primer on EIFS and most common nonporous building substrates, including glass and aluminum.
  • Offers balanced adhesive strength, medium modulus, and high recovery.
  • Exhibits excellent all-weather gunnability and performance.
  • Provides extension/compression capability of ±25 to ±40 percent.
  • Available in various packaging sizes, including 10.3 ounce cartridges, 20 ounce sausages, two-gallon pails, five-gallon pails, and 55-gallon drums.
  • Choose from a wide range of colors, including 20 standard colors, 19 special colors, and custom colors.
  • Backed by a 5-Year Weatherseal Limited Warranty.
Typical Properties
Adhesion to Alodine Aluminum, Aluminum, Anodized Aluminum, Brickwork, Ceramic Tiles, 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, Polyester Powder Coated Aluminum/Steel, Stainless Steel, Steel, Stone, Vinyl/PVC-U, Wood
Appearance Opaque
Chemistry Neutral
Color 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
Durometer - Shore A 20 to 30
Movement Medium
Movement Capability -40 to 40 %
Peel Strength 20 to 28 ppi
Resistance Type UV, Water, Weathering
Shelf Life 540 Days
Substrate Porous
Tensile Strength 180 psi
Volatile Organic Content 35 g/liter
Application Benefits
Primerless Adhesion Primerless
Processing-Formulating Benefits
Cure System 1-Part Cure
Room Temperature Cure - Hours 168 to 336 Hours
Tack-free Time (50% RH) 360 Minutes
Where Used Job Site

Additional information

Weight 1.6 lbs
Dimensions 1 × 1 × 1 in

Anodized Aluminum, Bronze, Gray