MasterSeal SL 2 multi-component, self-leveling polyurethane sealant

Formerly: Sonolastic SL 2

MasterSeal SL 2 description:

MasterSeal SL 2 is a multi-component, self-leveling, elastomeric polyurethane sealant that is mixed and poured in place. When cured, it forms a tough, resilient joint seal that resists penetration and abrasion and remains flexible when exposed to weather and aging.

Recommended uses:

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

What are the unique features of MasterSeal SL 2?

  • Wide temperature-application range makes MasterSeal SL 2 suitable for all climates
  • UL listed; Passes 4-hour, 4-inch, fire and hose stream test when used with Ultra Block or mineral wool
  • Suitable for water immersion with documented performance in wet areas
  • Bulk packaging results in less waste
  • Formulated to withstand pedestrian and vehicular traffic

What are the benefits of MasterSeal SL 2?

  • Abrasion resistant to help handle pedestrian and vehicular traffic
  • Joint movement capability ±25% provides excellent flexibility for keeping moving joints weather tight
  • Weather resistant, producing long-lasting weather tight seals
  • Easy to gun and tool, speeding up application and making neater joints
  • MasterSeal 905 accelerator available for use in cold climate applications to help speed initial cure
  • No primer required for most construction materials, lowering installation costs
  • Long pot life offers extended working time
  • Chemical cure allows for faster turnaround time

US / Canada Product Information

Data Guide

Data Guide (French)

Data Guide (Spanish)

Certification Letter

LEED Letter

LEED v4 Letter

Safety Data Sheets (SDS):

MasterSeal SL 2 - FIN SLG Limestone

MasterSeal SL 2 - FIN SLG Pre-Gray

MasterSeal SL 2 - FIN SLV Limestone Mix

MasterSeal SL 2 - SLV

Direct contact

Master Builders Solutions Technical Support

Construction Systems


Safety Data Sheet (SDS)

Find all available safety data sheets for this product.

Product Certifications

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Related Literature

Certification Letter

pdf (55.34 Kb)

Data Guide

pdf (351.50 Kb)

Data Guide (French)

pdf (197.18 Kb)

Data Guide (Spanish)

pdf (134.29 Kb)

Joint Sealants Brochure - Spanish

pdf (749.31 Kb)

LEED Letter

pdf (72.88 Kb)

LEED v4 Letter

pdf (54.82 Kb)


pdf (212.47 Kb)


pdf (53.27 Kb)


pdf (199.22 Kb)


pdf (200.77 Kb)

Sealant Performance Selection Guide

pdf (872.11 Kb)