BASF MasterSeal NP1 Elastomeric Polyurethane Sealant 11 oz, Clear or Tan

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BASF MasterSeal NP1 Elastomeric Polyurethane Sealant 11 oz, Clear or Tan


MasterSeal NP1 is a one-component, gun-grade elastomeric polyurethane sealant for sealing expansion joints, penetrations, and building gaps. Each order is one 11 oz cartridge, available in Clear or Tan. It requires no mixing and is easy to gun and tool for faster application and neater joints.


Key Features:

  • One-component formula: A single-component, non-priming, gun-grade sealant that requires no mixing.
  • Elastomeric movement: The elastomeric polyurethane body accommodates joint movement after curing.
  • Sound reduction: The sealant reduces sound transmission through sealed joints.
  • Easy tooling: Easy to gun and tool, allowing faster application and neater joints.
  • Non-priming: Non-priming formulation streamlines preparation on appropriate substrates.
  • Two colors: Available in Clear and Tan to match different substrates and finishes.

Specifications Table:

Specification Details
Brand BASF
Sell unit 1 cartridge, 11 oz
Product line MasterSeal NP1 Sonolastic
Available colors ['Clear', 'Tan']
Available sizes 11 oz cartridge
Material One-component elastomeric polyurethane sealant
Type Gun-grade, non-priming
Pack quantity 1 cartridge
Intended use Sealing joints and penetrations in building construction

Fit and Compatibility:

Designed for general construction joint and penetration sealing; apply with a standard 11 oz caulking gun. Prime only if testing on a specific substrate indicates it is needed.


Frequently Asked Questions (FAQ):

Q: What comes in the order?
A: One 11 oz cartridge of MasterSeal NP1 sealant in your choice of Clear or Tan.


Q: Does it need priming or mixing?
A: No. It is a one-component, non-priming sealant and requires no mixing.


Q: What sizes are available?
A: This listing offers an 11 oz cartridge; other packaging may exist elsewhere.


Q: Is it good for sound control?
A: Yes, the manufacturer states it reduces sound transmission through sealed joints.


Q: How is it applied?
A: Gun it into the prepared joint with a standard caulking gun and tool it before skin forms for a neat finish.


Expert Verdict — Reviewed by the SuperArbor Pro Desk

MasterSeal NP1 is a dependable general-purpose polyurethane for expansion joints, control joints, and penetrations on commercial and residential exteriors. Tool the bead within its open time for proper substrate contact. For substrate-specific performance, always run a test adhesion sample; urethanes require sound, clean, dry joints for best results.

Polyurethane sealants contain reactive chemicals; wear gloves and eye protection, ventilate the work area, and follow the product safety data sheet.


Order BASF MasterSeal NP1 sealant in Clear or Tan for your next joint-sealing job.

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Subject to Approval & Availability
All orders are reviewed before fulfillment. You are not charged until your order is approved and ready to ship — and you may cancel at any time before that at no cost.

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