Dowsil 791 Weatherproofing Sealant

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Price Per Unit: $15.60

Price Per Box: $14.04

Dowsil™ 791 is a versatile silicone sealant perfect for weatherproofing and glazing in construction. It offers exceptional resistance to harsh weather conditions and UV rays, ensuring a durable, long-lasting seal for various joint types.
Vendor: Dowsil
Availability: In Stock

Physical Properties

Cure system: Alkoxy
Application temperature: +5 to +40°c
Specific gravity: 1.50
Extrusion rate: 220 g/minute
Skin-over time (23°c, 50% r.h.): 20 minutes
Tack-free time (23°c, 50% r.h.): 30 minutes
Cure rate (23°c, 50% r.h.) 1 day: 2.0 mm
Cure rate (23°c, 50% r.h.) 3 days: 4.0 mm
Modulus 100% (2 mm thickness s2 dumb-bells): 0.45 mpa
Tensile strength (2 mm thickness s2 dumb-bells): 1.9 mpa
Elongation at break (2 mm thickness s2 dumb-bells): 700%
Modulus 100% (12x12x50 mm size t.a. joint): 0.35 mpa
Tensile strength (12x12x50 mm size t.a. joint): 0.75 mpa
Elongation at break (12x12x50 mm size t.a. joint): 380%
Hardness (shore a): 29
Elastic recovery: > 90%
Joint movement capability: ± 50%
Packaging: ["310 ml cartridges", "600 ml sausages"]
Technical specifications and standards: {"french voc regulations"=>"a+", "french cmr components"=>"pass", "italian cam edilizia"=>"pass", "agbb/abg"=>"pass", "belgian regulation"=>"pass", "emicode"=>"ec1 plus", "indoor air comfort"=>"pass", "indoor air comfort gold"=>"pass", "blue angel (de-uz 123)"=>"pass", "breeam international"=>"exemplary lvl", "breeam norway"=>"pass", "cdph"=>"pass", "m1"=>"pass", "byggvarubedomningen"=>"accepted"}

Shipping & Delivery

$15.95 shipping on all orders nationwide, except for DG goods.

Dowsil 791 Weatherproofing Sealant

Vendor: Dowsil

Dowsil 791 Weatherproofing Sealant


Vendor: Dowsil

Dowsil 791 Weatherproofing Sealant

Package Type: Single Buy

DOWSIL™ 795 Silicone Building Sealant

DOWSIL™ 795 is a versatile, one-part, neutral-cure silicone sealant designed for a wide range of construction applications. This high-performance sealant excels in both structural glazing and weather sealing, offering exceptional durability and resistance to harsh environmental conditions.

Key Features

  • Neutral cure for low odour and easy application
  • Excellent weatherability, resisting UV, rain, snow, and temperature extremes
  • High joint movement capability of ±50%
  • Strong adhesion to a wide variety of construction materials
  • Available in 15 standard colours with custom colour options
  • Meets global standards (Americas, Asia, and Europe)


  • Structural and non-structural glazing
  • Structural attachment of panel systems
  • Panel stiffener applications
  • Weather sealing for glass, aluminium, steel, painted metal, EIFS, granite, stone, concrete, brick, and plastics


  • Provides a long-lasting, flexible, and weathertight seal
  • Maintains structural integrity in demanding applications
  • Resists cracking, shrinking, and discoloration due to weather exposure
  • Excellent adhesion without the need for priming on most substrates
  • Easy application with all-temperature gunnability
  • Low-odour cure byproduct

Application Guide

  1. Ensure surfaces are clean, dry, sound, and free from grease.
  2. Clean non-porous surfaces with DOWSIL™ R-40 Universal Cleaner.
  3. Mask adjacent areas to prevent contamination.
  4. Prime if necessary (consult for specific recommendations).
  5. Use closed cell polyethylene backer rod if required.
  6. Apply sealant and tool within 5 minutes for optimal adhesion and finish.


  • Not recommended for below-grade applications or surfaces constantly immersed in water.
  • Avoid using on surfaces exceeding 50°C (122°F) during installation or materials that bleed oils or plasticizers.
  • Not for use in totally confined spaces or on frost-laden/wet surfaces.
  • Paints may not adhere well to the cured sealant.
  • Not suitable for food contact or medical/pharmaceutical applications.

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