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DOWSIL™ 758 Silicone Weather Barrier Sealant

A one part, neutral cure silicone sealant, designed for adhering to low energy surfaces common in sheet or peel and stick weather resistant barriers. Primerless adhesion to LDPE, anodized aluminum, vinyl, powder coated aluminum, Kynar® coated aluminum.


Strong adhesion strength to:

  • Self-adhered window flashing and wraps
  • Nonwoven spunbound window flashing and wraps
  • Polyethylene wraps
  • Polyethylene surfaces
  • Polypropylene surfaces
  • Common polyolefins
  • PVC
  • Steel, aluminum and metals
  • Fluorinated surfaces


  • High adhesion strength
  • Long-term silicone durability
  • Low-VOC formulation
  • Single-component, primerless application
  • ±25% movement capability
  • Passes 5,000 hr QUV test
DOWSIL™ 758 Sealant sticks to most demanding substrates without primer

Get primerless adhesion to window flashing and fenestration materials

Innovative DOWSIL™ 758 Silicone Weather Barrier Sealant solves the challenge posed by plastic- and polyolefin-based window flashing and fenestration materials, sticking to the most demanding substrates without need for a primer.

Detail drawing showing DOWSIL™ 758 Sealant placement


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

  • Adhesion to Fluoropolymers, Paint, Vinyl/PVC-U, Anodized Aluminum
  • Color White
  • Cure Type Neutral Cure
  • Durometer - Shore A 30 Shore A
  • Elongation 800 %
  • Flow/Sag (Slump) 0.06 mm
  • Movement Capability -25 to 25 %
  • Number of Parts One
  • Primerless Adhesion Primerless
  • Resistance Type UV Resistance
  • Tensile Strength 200 psi
  • Volatile Organic Content 25 g/liter
  • Working Time 15 Minutes

No Safety Data Sheets are available online for this material
Please Contact Dow for additional information.

No sales specification could be found for this material in selected language

DOWSIL™ 758 Silicone Weather Barrier Sealant
No Technical Data Sheets are available for this product
Please Contact Dow for additional information.

DOWSIL™ 758 Silicone Weather Barrier Sealant

No Regulatory Data Sheets are available for this product

DOWSIL™ 758 Silicone Weather Barrier Sealant
Please Contact Dow for distribution options available for this product.