Roof Sealant: SeamStitch Polyurethane Caulk 5g —
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Use coupon code WELCOME and get 15% off your first order.
Use coupon code WELCOME and get 15% off your first order.

SeamStitch Polyurethane Caulk 5g

by Lexis
Save 6% Save 6%
Original price $339.00
Original price $339.00 - Original price $339.00
Original price $339.00
Current price $319.00
$319.00 - $319.00
Current price $319.00

This product cannot be shipped to California.

SeamStitch Polyurethane Caulk is a high-solids, single-component, moisture-cure, solvent-based polyurethane roof sealant known for its outstanding protection and durability. Its elastomeric nature allows it to expand and contract with temperature fluctuations, ensuring reliability in any climate.


  • Primary Use: Seals fasteners, seams, laps, and flashings before applying elastomeric roof coatings. 
  • Secondary Use: Offers superior adhesion and corrosion resistance on metal and modified bitumen roofs, while maintaining a leak-free surface on single-ply and sprayed polyurethane foam roofs.


  • Durable Membrane: Provides a seamless, strong layer to seal and repair existing leaky roofs.
  • Breathable Protection: Prevents moisture entrapment, reducing the risk of premature roof failure.
  • Superior Adhesion: Bonds effectively to difficult substrates, making it an excellent primer and base coat for asphalt and single-ply roofs.
  • Enhanced Protection: Top coat with silicone roof coatings to increase UV and ponding water resistance.
  • Clean the application area thoroughly, ensuring it is dry and free of oil, grease, dirt, or loose coatings for optimal adhesion.
  • Apply using a brush, roller, or spray equipment based on the project's requirements, ensuring even and thorough coverage.
  • Apply the caulk when the temperature is between 45°F and 95°F and the relative humidity is below 85% to ensure proper curing.
  • Apply the caulk in layers, allowing 24 hours of drying time between coats, at a rate of 1.5 gallons / 100SF per coat.
  • Clean tools with Xylene immediately after use and ensure proper ventilation and protective gear during application to avoid inhaling fumes and contact with skin.
  • Clean Up: Xylene
  • Color: Light Gray
  • Elongation: 150% ±50
  • VOC: Less than 50 grams per liter

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