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Tremco Dymonic FC in cartridge and sausage foil packaging
Stack of Tremco Dymonic® FC foil sausage packs used for high-performance sealant applications
Dymonic FC fast-curing polyurethane sealant tube for construction joints
Applying Tremco Dymonic® FC sealant to a concrete-to-window frame joint using a manual caulking gun
Dymonic FC hybrid sealant sausage packs displayed on top of branded Tremco packaging box from Firestop Caulking Supply

Dymonic FC

A single-component, low-modulus, hybrid sealant formulated with proprietary polymer technology that offers a rapid, durable, flexible seal that performs excellently in moving joints and exhibits tenacious adhesion to substrates once fully cured.

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Product Type

High-Performance Fast-Curing Hybrid Sealant
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Dymonic FC Sealant – Product Description

Dymonic FC is a premium, fast-curing polyurethane hybrid sealant developed for high-performance sealing in dynamic joints. With superior movement capability, excellent UV resistance, and broad substrate compatibility, it is a top-tier solution for both commercial and residential construction projects. This hybrid formulation is engineered to perform under pressure, offering rapid skin time and long-term durability in indoor and outdoor applications.

Unlike traditional polyurethanes, Dymonic FC combines the elasticity of silicone with the adhesion and toughness of polyurethane. It’s an excellent choice for jobs that demand fast return-to-service and long-term weatherability. The sealant offers a smooth, uniform finish that can be painted after full cure—making it versatile across a wide range of architectural designs. Because it adheres well to precast, EIFS, masonry, and coated surfaces, it eliminates the need for primer in many applications.

Why Choose Dymonic FC?

Dymonic FC sealant is known for its quick curing time—forming a skin in about 60 minutes and becoming tack-free within 3 to 4 hours under normal conditions. This allows for efficient application and faster job completion. Its resistance to “green cracking” ensures reliable performance even with early joint movement, making it especially valuable in fast-paced construction timelines. The formulation also provides low dirt pickup, keeping joints looking clean over time.

In addition to its excellent mechanical performance, Dymonic FC is fire-rated and approved for use in tested fire-rated joint systems. It is also compatible with exterior insulation and finish systems (EIFS), making it a go-to solution for energy-efficient envelope construction. Whether sealing control joints, vertical interfaces, or complex transitions, Dymonic FC delivers professional-grade results with every bead.

Key Benefits

  • Fast-Curing: Skins in ~60 minutes and tack-free in 3 to 4 hours for quick application and project turnaround.
  • Improved Aesthetics: Offers low dirt pickup and comes in a wide variety of standard color options.
  • Paintable: Can be painted after full cure.
  • Rapid Performance: Resists green cracking, even with early joint movement.
  • Multi-Use: Compatible with most common construction substrates.
  • Fire Rated: Approved for use in multiple fire-rated joint systems.
  • EIFS Friendly: Safe for use with exterior insulation and finish systems (EIFS).

Dymonic FC Is Best For:

  • Expansion and control joints
  • Precast concrete panel joints
  • Perimeter caulking
  • EIFS
  • Vinyl siding

Product Properties

Property Specification
Application Method Caulk gun, trowel
Application Temperature 40 to 90 °F (4 to 32 °C)
Coverage Rate 12 ft. @ .5″ x .25″ (10.1 oz)
Drying/Cure Time 14 to 21 days

View more Tremco sealant products
Learn more on the official Dymonic FC product page.

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