Construction Sealants

Protect the Long-Term Integrity of Your Structure with MasterSeal Sealants​

Even seemingly small moisture leaks in structures can cause major damage that disrupts lives and business operations. For contractors, architects and engineers, moisture issues can cause costly callbacks, damaged reputations and strained relationships. All that makes using the right construction sealant or caulk a critical detail in building construction. 

MasterSeal Is the Versatile Choice

MasterSeal construction sealants are designed for longevity and ease of application, offering the following benefits to keep buildings watertight:​​

  • Tenacious adhesion that bonds to multiple substrates, for application versatility 
  • Flexibility to withstand exposure to movement, weather and aging
  • Long-lasting durability
  • Wide range of colors to meet your aesthetic requirements
  • Ease of use, speeding up jobsite application

Construction Sealant Products

Gun-Grade / Non-Sag Sealants

MasterSeal NP 1

One-component, polyurethane sealant with movement capability ±35% | Versatile - bonds to concrete, masonry and many other substrates without a primer | Weather-resistant for long-lasting, weathertight seals | Ideal for windows, doors and siding

MasterSeal CR 195

One-component polyurethane sealant with movement capability ±25% | Abrasion, puncture and pick-resistant | Ideal for security and institutional applications

MasterSeal NP 2

Multi-component, polyurethane sealant with movement capability ±50% | Long pot life for extended working time | Withstands pedestrian and vehicular traffic | Accelerator available for fast cure in cold climates

MasterSeal NP 100

Hybrid sealant – combines polyurethane & silicone properties | Movement capability ±50% | Strong adhesion to a wide range of substrates including metal, vinyl, PDVF coatings, concrete, wood, masonry & stone.

MasterSeal NP 125

One-component thermoplastic sealant and adhesive | Available in clear, white, black and brush-grade | Bonds to wide variety of materials | Ideal for roofing applications

MasterSeal NP 150

Hybrid sealant – combines polyurethane and silicone properties | Ideal for Stucco and EIFS | Resists chalking, fading and cracking from UV exposure | Compatible with elastomeric coatings and can be painted soon after installation

MasterSeal NP 150 Tint Base

A multi-component, moisture-curing, low-modulus,high-movement, fast-setting, hybrid sealant | Wide temperature application range | Non-staining formula for use on stone and other sensitive substrates

MasterSeal TX 1

One-component polyurethane sealant with movement capability ±25% | Textured appearance blends well with many masonry substrates | Ideal for brick and concrete

MasterSeal NP 520

Single-component, siliconized acrylic latex sealant | Enhanced adhesion and weatherability for long-lasting seals | Can be painted in 2 hours after application
Joint Fillers

MasterSeal CR 100

Polyurea joint filler protects joints in industrial concrete floors | Excellent resistance to spalling, abrasion, chemical attach and corrosion | Fast curing technology for faster return to service

MasterSeal CR 190

Epoxy joint filler protects joints in industrial concrete floors | Excellent resistance to spalling, abrasion, chemical attach and corrosion
Pourable / Self-Leveling Sealants

MasterSeal CR 125

Polyurethane sealant for horizontal joints in chemical & industrial environments | Movement capability ±25% | Weather, chemical & jet fuel resistant

MasterSeal SL 1

One-component polyurethane sealant with movement capability ±35% | Excellent adhesion to concrete and metal | Use where abrasion and puncture resistance are required | Ideal for horizontal applications like sidewalks & concrete floors

MasterSeal SL 100

Hybrid sealant with movement capability ±35% | Can be applied to damp and green concrete | Fast curing and easy to gun to speed up jobsite production

MasterSeal SL 2

Two-component polyurethane sealant with movement capability ±25% | Forms a tough, resilient joint seal that resists penetration & abrasion | Suitable for water immersion | Ideal for horizontal applications like traffic & plaza decks

MasterSeal SL 180

Flowable polyester sealant | Designed for traffic control industry to embed and protect detector loop wire for traffic signals and parking gates | Cures quickly to minimize traffic disruption
Primers & Accessories

MasterSeal P 173 and P 176

Quick drying primer for joints and substrates | Use before application of MasterSeal NP 1, NP 2, NP 150, TX 1, CR 195, SL 1 & SL 2 joint sealants to improve adhesion to substrates that require a primer

MasterSeal P 179

Quick drying primer for porous substrates such as concrete, masonry and stone when using MasterSeal NP 150 / NP 150 Tint base
Construction sealant being used to fill an exterior joint.

Direct contact

Master Builders Solutions Technical Support

Construction Systems


Related Literature

Joint Sealants Brochure

pdf (851.29 Kb)

MasterSeal most popular colors brochure

pdf (676.42 Kb)

Sealant Performance Selection Guide

pdf (872.11 Kb)