Primers / Sealants

Primers / Sealants

GacoFlex 2100 MS

2100 MS Silyl-Modified Adhesive Sealant

The same proven adhesive sealant — just with a new name.
Now part of the Gaco family of brands, 2100 MS continues to provide the same proven performance contractors have counted on for decades — just with a new name. You can expect the same protection, durability, and ease of use, now backed by Gaco’s expanded portfolio and commitment to building envelope solutions.

GacoFlex 2100 MS Adhesive Sealant is a high-performance reactive silyl-modified adhesive sealant. This single component, moisture-cure sealant exhibits excellent bond strength after cure. It imparts integral flexibility, offers superior adhesion and resists both ultraviolet and infrared radiation.

Contractors choose 2100 MS because it applies easily and tools smoothly. It cures with minimal shrinkage, forms a fast skin, and bonds without a primer to most substrates. As a result, it works as a true all-purpose sealant for a wide range of jobs.

After cure, 2100 MS forms a tough, elastic consistency with superior cut and tear resistance. It remains permanently flexible, which helps it withstand weather and building movement over time. In addition, it is both paintable and stainable, allowing you to blend repairs seamlessly.

At Gaco, we believe there’s a difference between just any solution and the right solution. You deserve the right solution and Gaco’s team of experts will help you find it! Find 2100 MS near you or contact your local Gaco Area Manager with questions.

Benefits

  • EASE OF APPLICATION. Can be applied with a standard caulking gun or industrial pump and flow gun equipment.
  • TRANSFORM EXISTING SURFACES. Transforms a roof with cracks, gaps, and penetrations into a foundation ready to coat with a GacoFlex roof coating.
  • UV STABLE. 2100 MS does not require a top coat. It will not chalk, crack, or peel.
  • BACKED BY GACO. 2100 MS is the same adhesive sealant that’s been proven for years, now part of the Gaco family of brands.

Applications*

    • Cracks
    • Gaps
    • Flashings
    • Holes
    • Lap Seams
    • Joints
    • Pipes
    • Penetrations
    • Roof Curbs
    • Skylights

*Use fabric reinforcement for flashings and lap seams. Embedding polyester fabric in the sealant should strengthen repairs to gaps or cracks exceeding 1/4-inch across.

Details

  • Available in 20 oz. sausage tubes and 2.5 gallon pails
  • 1-year shelf life
  • Material warranties available at www.gaco.com/warranty
  • Colored White
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Document Type

GACOFLEX 2100MS SILYL MODIFIED ADHESIVE SEALANT PDS July 2nd, 2026 Product: GacoFlex 2100 MS Product Data Sheets
GACO SAFETY DATA SHEED (SDS) - ALTERNATE ACCESS April 2nd, 2024 Product: Gaco 052N Safety Data Sheets
Primers / Sealants

GacoFlex 2100 MS

Primers / Sealants

GacoFlex 2100 MS

Primers / Sealants

GacoFlex 2100 MS

Primers / Sealants

GacoFlex 2100 MS

Primers / Sealants

GacoFlex 2100 MS

Primers / Sealants

GacoFlex 2100 MS

Primers / Sealants

GacoFlex 2100 MS