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MASTERSEAL NP 1 20 oz

Item #: MASTERSEALNP120oz
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BASF MASTERSEAL NP 1  20 OZ

MasterSeal NP 1 is a one-component, high performance, non-priming, gun-grade, elastomeric polyurethane sealant. It requires no mixing and typically requires no priming to bond to many materials, including concrete and masonry.

(Formerly known as: Sonolastic NP 1)

This polyurethane sealant, MasterSeal NP 1, is suitable for both interior and exterior use, above and below grade, in water, and in expansion joints keeping moving joints weathertight. It is also commonly used for applications involving panel walls, precast units, aluminum and wood window frames, roofing, fascia, parapets, vinyl siding and storefront assemblies.

MasterSeal NP 1 can bond to the following substrates:

  • Concrete
  • Masonry
  • Aluminum
  • Steel
  • Wood
  • Many plastics
  • Glass
  • Porcelain
  • Tile
  • Fiberglass

Master Builder Solutions elastomeric, polyurethane sealants, especially MasterSeal NP 1, provide many advantages to professionals who need a high-performance, one-component material. For example, NP 1 is available in ProPaks, which are pre-measured, single-use packs that contain the exact amount of sealant for a specific application. Designed to reduce waste and save time on job sites by eliminating the need for measuring and mixing.

MasterSeal NP 1 is a reliable and convenient solution for sealing various construction materials, with no need for mixing or priming when used on many substrates, including concrete and masonry. The product is available in 12 standard colors and meets VOC requirements in all 50 states, while also being UL listed and passing fire and hose stream tests, suitable for water immersion, and capable of ±35% joint movement. Additionally, it boasts superior holding power for long-lasting roof tile installation and is easy to gun and tool for efficient and precise application.


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