Masterseal NP 150: Tint Base Hybrid Sealant 1.5 Gallon Pail


  • Wide temperature application range
  • Non-staining formula for use on stone and other sensitive substrates
  • Meets all state and federal VOC regulations
  • Superior adhesion results in a long-lasting bond, helping to reduce call backs
  • Low modulus to accommodate for joint movement (100% extension in EIFS joints with little stress on bond line)
  • Can be painted with elastomeric coatings soon after installation
  • Easy to gun and tool, speeding up application
  • Weather resistant for long-lasting weather tight seals
  • Fast-curing helps to speed up jobsite production​
  • See bottom of page 3 of technical data sheet for coverage chart

Technical Data Sheet

Safety Data Sheet

Sealant Coverage Chart

Sealant Quantity Calculator

175 in stock

Masterseal NP 150

MasterSeal NP 150 is a high-performance, hybrid sealant designed to meet the most demanding sealing requirements. Its low modulus nature allows for impressive flexibility, enabling the sealant to accommodate high movement and changes in grade joints without compromising the integrity of the seal. This makes MasterSeal NP 150 an excellent choice for dynamic applications where joint movement can be significant.

MasterSeal NP 150: Robust and Versatile Hybrid Sealant

Compared to traditional silicone sealants available in a silicone sealants store, MasterSeal NP 150 offers superior durability and resilience, thanks to its hybrid sealants formulation. This innovative product is suitable for both vertical and horizontal applications, handling temperature fluctuations and environmental conditions with ease. With its robust performance and impressive adaptability, MasterSeal NP 150 stands out as a sealant of choice for challenging construction and maintenance tasks.

Masterseal NP 150 Surface Preparation

Substrates must be structurally sound, fully cured, dry and clean before use of masterseal NP 150. Substrates should always be free of the following: dirt, loose particles, oil, grease, asphalt, tar, paint, wax, rust, waterproofing or curing and parting compounds, membrane materials and sealant residue.


1.MasterSeal NP 150 comes ready to use. Apply using professional grade caulking gun. Do not open masterseal NP 150 pails until preparatory work has been completed.
2.Fill joints from the deepest point to the surface by holding an appropriately sized nozzle against the back of the joint.
3.Dry tooling is recommended. Proper tooling results in the correct bead shape, neat joints, and optimal adhesion.
4.MasterSeal NP 150 can be applied below freezing temperatures down to 10 °F only if substrates are completely dry, free of moisture and clean.


The cure of MasterSeal NP 150 varies with temperature and humidity. The following times assume 75 °F (24 °C), 50% relative humidity, and a joint ½” width by ¼” depth (13 by 6 mm).
–Skins: 60–90 minutes
–Full cure: approximately 1 week
–Immersion service: 21 days


1.Immediately after use masterseal NP 150, clean equipment. Use proper precautions when handling solvents.
2.Remove cured sealant by cutting with a sharp-edged tool.
3.Remove thin films by abrading.

Applicable Substrates for Masterseal NP 150

  • EIFS
  •  Stucco
  •  Aluminum
  •  Concrete
  •  Masonry
  •  Wood
  •  Stone
  •  Metal
  •  Vinyl
  •  Fiber cement siding

Product Highlights

MasterSeal NP 150 stands as a high-performance low modulus hybrid sealant that optimally suits both vertical and horizontal exterior applications. Notably, this innovative product is designed to reduce jobsite waste, leading to lower disposal costs. This efficiency not only supports more sustainable construction practices but also results in significant cost savings. Further, MasterSeal NP 150 is engineered to meet and surpass industry standards for durability and resilience, ensuring its suitability for a wide range of tasks and giving superior adhesion results. Its ability to withstand various application weather conditions emphasizes its superior performance and reliability. Additionally, the environmentally conscious approach of MasterSeal NP 150 meets modern demands for sustainable practices while providing a weather-resistant solution that effectively lowers disposal costs. In summary, MasterSeal NP 150 is a top-tier low modulus hybrid sealant choice, blending efficiency, durability, and eco-friendliness in one high-performing product.

Shelf Life

15 months when properly stored.

Weight 16 lbs
Dimensions 10 × 10 × 12 in