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100+ bought last week
Master Builders Solutions NP1 10.1-oz Exterior and Specialty Stone Paintable Advanced Sealant Caulk
Item #703710 |
Model #NP1STN12
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Manufacturer Color/Finish: Stone
Unavailable
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Learn MoreMasterseal Np1 is a 1 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.
Multiple external and internal applications including sealing door and window frames, roofing substrates, and cladding joints
Bonds to metals, masonry, wood, vinyl, cement fiber board, granite and marble
Low solvent content - under CARB limits
Non-shrinking
High movement and flexibility
Paintable with multiple coating types
Cures in less than 72 hours
Skin time in less than 24 hours
CA Residents: Prop 65 Warning(s)
General | |||
|---|---|---|---|
Color/Finish Family | Gray | Product Set Time | 12-24 hours |
Manufacturer Color/Finish | Stone | Paintable | Yes |
Series Name | NP1 | Container Type | Cartridge |
Type | Advanced Sealant | Clean-up Method | Mineral spirits |
Package Quantity | 1 | Fire Rated | Yes |
Use Location | Exterior | Caulk Gun Needed | Yes |
Unit of Measure Quantity | 10.1 | Heat Resistance in Degrees F | Up to 225 |
Unit of Measure | Ounce(s) | Paint Ready Time | Greater than 7 days |
Project Type | Exterior & specialty | Water Ready Time | Greater than 24 hours |
Dimensions | |||
|---|---|---|---|
Container Size | 10.1-oz | Coverage Area (Linear Foot) | 24.4 |
Features | |||
|---|---|---|---|
Dry to Touch | 30 minutes | Sanded/Unsanded | Unsanded |
Fire Resistant | Yes | Self Leveling | No |
Mildew Resistant | Yes | Stain Resistant | Yes |
Mold Resistant | Yes | Waterproof | Yes |
Sandable | No | ||
Certifications | |||
|---|---|---|---|
CA Residents: Prop 65 Warning(s) | ASTM Certified | No | |
Compatibility | |||
|---|---|---|---|
For Use in Bathrooms | No | For Use on Vinyl | Yes |
For Use in Kitchens | No | For Use on Masonry | Yes |
For Use on Plastic | No | For Use on Doors | Yes |
For Use on Stone | Yes | For Use on Tile | Yes |
For Use on Metal | Yes | For Use on Siding | Yes |
For Use on Wood | Yes | For Use on Windows | Yes |
For Use on Concrete | Yes | For Use on Gutters | Yes |
For Use on Drywall | No | For Use on Roofing | Yes |
For Use on Glass | No | For Use on Trim/Moulding | Yes |
For Use on Fiberglass | No | For Use on Marine | No |
Miscellaneous | |||
|---|---|---|---|
UNSPSC | 31201600 | ||
Check out the Best Selling Caulk on Lowes.com
Review
231 Reviews
90% Recommend this product
Ratings may include incentivized customer reviews.
What Customers Are Saying
The product is widely praised for its superior performance, strong adhesion, flexibility, and water-tight sealing capabilities. Many users describe it as an excellent sealant for various applications like windows, doors, roofs, and septic systems. However, some customers experienced issues with difficulty squeezing the product out of the tube, longer curing times, and problems with damaged or hardened tubes upon arrival. A few reviewers also found the product challenging to work with compared to other types. Overall, the consensus is that the product is a high-quality, durable sealant that performs exceptionally well, despite some minor drawbacks.
Customer review summary generated by AI, including incentivized reviews.231 Customer Reviews
Good stuff, but not as good since bought by Sika
Been using this for years. It can be applied in water or wet surfaces if you solvent clean them
MurphOctober 17, 2025
From NP1 10.1-oz Exterior and Specialty Medium bronze Paintable Advanced Sealant Caulk Verified Purchaser
From NP1 10.1-oz Exterior and Specialty Medium bronze Paintable Advanced Sealant Caulk Verified Purchaser
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NP1 chalk
Good stuff. Has a pleasant odor as well. Kinda on the pricey side.
BillyAugust 17, 2025
From NP1 10.1-oz Exterior and Specialty Tan Paintable Advanced Sealant Caulk Verified Purchaser
From NP1 10.1-oz Exterior and Specialty Tan Paintable Advanced Sealant Caulk Verified Purchaser
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NP1 - Med. Bronze Caulk (sealant) is Excellent!
NP1 is a very high quality exterior caulk (sealant) product that holds up and performs well over time. I have been using it for years doing roofing repairs & on roof replacement jobs in the DFW/NTX market
NTX Roofer Steve GJuly 29, 2025
From NP1 10.1-oz Exterior and Specialty Medium bronze Paintable Advanced Sealant Caulk Verified Purchaser
From NP1 10.1-oz Exterior and Specialty Medium bronze Paintable Advanced Sealant Caulk Verified Purchaser
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Plants
This product worked as advertised. However, every time we buy plants there, they die!! We know how to take care of plants, it’s not us. It’s a 50/50 shot buying a plant there as to whether it lives or not…not happy about that…
MarkJuly 27, 2025
From NP1 10.1-oz Exterior and Specialty Black Paintable Advanced Sealant Caulk Verified Purchaser
From NP1 10.1-oz Exterior and Specialty Black Paintable Advanced Sealant Caulk Verified Purchaser
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32 Questions
32 Questions
Anonymous on July 20, 2018
3
Answers
Anonymous on October 13, 2015
2
Answers
Jeffrey10 on November 29, 2024
1
Answer
ECobber on July 28, 2023
1
Answer
DMc on June 25, 2023
1
Answer
Anonymous on January 20, 2021
1
Answer
Anonymous on April 2, 2019
1
Answer
Anonymous on January 1, 2019
1
Answer
halt on June 16, 2018
1
Answer
What is the lowest temperature that is still okay to use?
Wm on October 26, 20250
Answers