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MASTERSEAL NP 1 10 oz.

Item #: MASTERSEALNP110oz
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BASF MASTERSEAL NP 1 10oz. Tube 

MasterSeal NP 1 10 oz is a high-performance, non-priming, gun-grade elastomeric polyurethane sealant that can adhere to many substrates and be used for various applications.

(Formerly known as: Sonolastic NP 1)

MasterSeal NP 1 is a versatile and high-performance sealant that can adhere to many substrates without priming, including concrete and masonry. This non-sag, paintable solution is suitable for a wide range of interior and exterior applications, both above and below grade, including those that are immersed in water, such as expansion joints, panel walls, precast units, window frames, roofing, fascia, parapets, vinyl siding, and store front assemblies.

MasterSeal NP 1 10 oz. is suitable for many substrates, including:

  • Concrete
  • Masonry
  • Aluminum
  • Steel
  • Wood
  • Clay & Concrete Roof Tiles
  • Stucco
  • Natural Stone

One of the unique features of MasterSeal NP 1 is its wide temperature application range of -40 to 180°F, which makes it suitable for use in all climates. Additionally, it meets VOC requirements in all 50 states and offers a joint movement capability of +/- 35%, providing excellent flexibility for keeping moving joints weather-tight.

When used with Ultra Block or mineral wool, MasterSeal NP 1 is UL listed and can pass the 4-hour, 4-inch fire and hose stream test. It is also suitable for water immersion and has documented performance in wet areas. The sealant is weather-resistant, ensuring long-lasting weather-tight seals, and is compatible with non-rigid coatings and can be painted.

Key benefits of MasterSeal NP 1 is its one-component formula, which requires no mixing. It is also easy to gun and tool, speeding up application and making neater joints. Furthermore, for most construction materials, no primer is required, lowering installation costs. Finally, the sealant has superior holding power, making it ideal for long-lasting roof tile installation.


Joint Size D x W Inches 1 Gallon 10.3 Fl. Ounce Tube 20.3 Fl. Ounce Sausage 2 Gallon 4.5 Gallon Pail
3/16 x 1/4 411 33 64 821 1848
3/16 x 3/8 272 22 43 548 1232
3/16 x 1/2 205 16 32 411 924
3/16 x 5/8 164 13 26 329 739
3/16 x 3/4 137 11 21 274 616
1/4 x 1/4 411 33 64 821 1848
1/4 x 3/8 272 22 43 548 1232
1/4 x 1/2 205 16 32 411 924
1/4 x 5/8 164 13 26 329 739
1/4 x 3/4 137 11 21 274 616
3/8 x 1/4 411 33 64 821 1848
3/8 x 3/8 272 22 43 548 1232
3/8 x 1/2 205 16 32 411 924
3/16 x 5/8 164 13 26 329 739
3/8 x 3/4 137 11 21 274 616