MasterSeal SL1 Self Leveling Polyurethane Sealant 28 oz.


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The Limestone (light-gray) color more closely matches newly poured concrete for good appearance. MasterSeal SL 1 joint sealant is a one-component, self-leveling, UV resistant, exterior grade, non-priming polyurethane sealant designed for creating, sealing and waterproofing all type of concrete and metal expansion joints up to 1-1/2 inch in width.

SL1 requires no mixing and bonds to many materials without a primer, including concrete, masonry, metals, fiberglass, etc.

  • One 825ml tube yields about 36 lineal ft. (1/2 inch x 1/4 inch joint).
  • 300 psi tensile and 800% elongation.
  • Skins over: within 24 hours
  • Foot traffic: 3 days
  • Full cure: 1 week
SKU: SL1 Category:


Recommended Uses:

  • Horizontal
  • Interior and exterior
  • Expansion joints
  • Control joints
  • Pavers
  • Plaza decks
  • Industrial floors
  • Driveways/garages
  • Sidewalks
  • Decks
  • Parking structures
  • Pitch pans


  • Variety of types and sizes of packaging to help reduce jobsite waste
  • Wide application temperature range makes MasterSeal SL1 suitable for all climates
  • Excellent weatherability for long-lasting performance
  • Movement capability of ±35% allows expansion and contraction with joint movement
  • Abrasion-resistant to provide for longer wearing and durability
  • Easy to gun for quick installation
  • No priming needed on most surfaces, offering excellent adhesion
  • Self-leveling sealant, so no tooling needed

Not recommended for asphalt sealing, asphalt expansion joints, or contact with asphalt products.

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