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Fast Cure Sealants: Accelerating Construction Timelines and Increasing Productivity

Applying a fast-cure sealant for joint sealant applications will accelerate construction timelines and increase productivity. Accelerating construction can help contractors and developers save money, avoid problematic weather delays, and even realize contract bonuses. Therefore, contractors should select time-saving methods and products, like fast-cure sealants, to keep a project on time, or to accelerate completion.

Silyl Terminated Polyether (STPE) sealants are fast-cure sealants that combine the weather resistance of silicone with the strength of polyurethane to create a long-lasting sealant with superior strength, adhesion, and flexibility. Fast-cure sealants also maintain their appearance by limiting adherence of dust and debris, which can be a problem with other types of sealants.

STPE sealant bonds to most construction materials (stone, masonry, concrete, fiber cement, vinyl, stucco, wood) for sealing joints and gaps around wall penetrations, floor lines, fixtures, etc., for a tight building envelope. 

A tight building envelope keeps outside elements (primarily moisture and air) from infiltrating a structure. Correctly applying a high-performing STPE joint sealant, like StoSeal STPE Sealant, is critical to weatherproofing a building’s exterior and protecting its integrity and health.

STPE Sealant Advantages

STPE technology creates sealants with several high-performance features compared to polyurethane and silicone sealants:

  • Cure Rate: STPE sealants cure quickly, even at low temperatures.
  • Weather Resistant and Durable: STPE sealants perform well at low temperatures and in most weather conditions, from dry to extremely wet and rainy, with no splitting, cracking, discoloration, or adhesion failures.
  • Cold Resistant: STPE sealants retain their properties to -50°F (-45°C).
  • UV Resistant: STPE sealants will not crack or yellow after extended periods of UV-light exposure, unlike polyurethane sealants. 
  • Easy Application: STPE sealants do not require priming (unlike silicone and polyurethane) and can create a continuous smooth surface that can be painted after 24 hours. 
  • Flexibility: STPE sealants’ elongation characteristics can endure structural movement and withstand substrate vibrations or oscillations more effectively than silicone sealants. 
  • Adhesion: STPE sealants adhere more effectively to various substrates, like concrete, wood, plastics, ceramics, and metals, compared to polyurethane and silicone sealants.
  • Environmentally Friendly: STPE products contain extremely low or no VOCs, unlike polyurethane that is prone to off-gassing.
  • Non-Reactive: STPE sealants will not corrode or oxidize metals.
  • Storage Stability: STPE sealants have an excellent shelf life when properly stored in dry conditions.

StoSeal STPE High-Performance, Versatile Adhesive Sealant


Sto Corp. recently launched StoSeal STPE Sealant – a high-quality, isocyanate-free, low-odor, one-part hybrid sealant with a VOC content (8 grams per liter). Durable, flexible, low-modulus and non-sag StoSeal STPE Sealant provides excellent weathering and moisture resistance.

StoSeal STPE Sealant has superior adhesive properties that work effectively with StoTherm® ci, StoQuik®, StoPowerwall®, StoVentec®, and StoPanel Technology® exterior wall systems exterior wall systems and with StoGuard® air- and water-resistive barrier system for vertical above-grade building restoration and new opaque wall applications. It can be utilized for interior use, panel-to-panel joints in prefabricated construction, metallic and cementitious substrates, storefront systems, concrete repair, and air sealing applications.

Benefits and features of StoSeal STPE Sealant include:

Simplifies Installation 

  • Accelerates construction timeline and productivity
  • Fully tested and compatible with other Sto systems components
  • Fast, tack-free cure times, for a paintable, low dirt pickup sealant for new opaque wall and building restoration applications
  • Primer-free bonding to most substrates
  • Easy to gun and tool
  • Packaged in 20-ounce sausages to minimize construction waste and offer efficient installation


  • Provides +100%/-50% movement —suitable for high and low movement joints.

Wide-range Color Options

  • Comes in ten standards and over 300 custom colors

Paintable with Elastomeric Coatings

  • Allows for top coating with elastomeric coatings to suit most color requirements

Superior Adhesion

It will bond to most building materials without the use of primer.

Durable, Long-Lasting

StoSeal STPE Sealant provides excellent weathering- moisture-, UV-, shrink- and aging-resistance


StoSeal STPE Sealant lacks Isocyanate and contains very low VOC – it will not bubble and releases very little odor. 

Storage Stable

When properly stored in unopened, original packaging and in dry conditions, the sealant has a 12-month shelf life.

StoSeal STPE Sealant Compliance Testing

StoSeal STPE Sealant complies with:

  • Federal Spec. TT-S-00230C Type II
  • AAMA 808.3 (Type1) Exterior Perimeter Sealing
  • ASTM C1382 for use with EIFS
  • ASTM C920: Type S, Grade NS, Use NT, A, M, Class 100/50

Where to Use StoSeal STPE Sealant 

StoSeal STPE Sealant bonds to most construction materials, including concrete, masonry, stone, stucco, fiber cement, aluminum, wood, vinyl, and steel. It can be used for various applications in new and existing buildings in Sto proprietary wall assemblies (StoTherm® ci, StoQuik®, StoPowerwall®, StoVentec®, and StoPanel Technology® exterior wall systems exterior wall systems and with StoGuard® air- and water-resistive barrier systems) and other wall systems. 

Examples of applications include:

  • Control joints
  • Thermal expansion and contraction joints
  • Panel-to-panel joints between precast, metal frame, and other prefabricated wall construction
  • Bedding sealant for flashing, flanged windows, and related applications
  • Deflection joint sealant at floor lines
  • Perimeter weather seal around windows, doors, scuppers, and other through-wall penetrations
  • Air seal at interior or exterior joints and seams for air barrier continuity
  • Perimeter weather seal around fixture attachments

Why Choose Fast Cure StoSeal STPE Sealant?

Fast-cure sealants, like the StoSeal STPE Sealant, can assist in accelerating construction timelines and increasing productivity, saving money and avoiding weather delays.

Furthermore, air sealing the penetrations, joints, and other gaps in a building envelope with high-performing, fast-curing, color-fast StoSeal STPE Sealant can significantly contribute towards a tight building envelope. 

A tight building envelope protects a building’s integrity and increases the occupant’s comfort level by preventing moisture, drafts, and unwanted noise from infiltrating the building. In addition, the sealant can also improve indoor air quality by minimizing pollution and mold exposure and can reduce energy use to save money.

Durable, weather-resistant, flexible, and non-toxic StoSeal STPE Sealant provides superior adhesion when applied to vertical above-grade new opaque walls and building restorations. It also maintains its appearance by limiting adherence of atmospheric dust and debris. For more on how StoSeal STPE fast cure Sealants can accelerate construction timelines and increase productivity, contact our professionals at (800) 221-2397!

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