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MasterSeal NP1 Polyurethane Sealant - A versatile moisture-curing high-performance polyurethane sealant with permanent elasticity (Formerly: Sonolastic NP 1). For use on active, vertical and horizontal interior, exterior joints including expansion wall joints, floor and pavement joints, curtain walls, panel walls, precast walls, window frames, structural components, dams, spillways, and storm water drains. Substrates include concrete, masonry, aluminum, and wood. Bonds to concrete, masonry, and other materials without a primer. Does not require mixing. Skins overnight and fully cures within a week. Dries smooth and is paintable. Under ideal conditions: Skins over (24 hrs), Functional (3 days), Full Cure (5-7 days). Does not contain a fungicide, but does not generally harbor mold/mildew growth. Longevity: Up to 15 years. Meets federal specifications TT-S-00230C, Type II, Class A; ASTM-C-920, Type S, Grade NS, Class 25 - use NT, M, A, G, and I; Corps of Engineers CRD-D-541, Type II, Class A; and ISO 11600-F-25LM. USDA approved for use in meat and poultry areas. Canadian approval for use in establishments that handle food. SWRI validated. Joint movement capability +/- 35%. 10.1 Oz tube. Shelf life: 12 months. - A versatile moisture-curing high-performance polyurethane sealant with permanent elasticity (Formerly: Sonolastic NP 1). For use on active, vertical and horizontal interior, exterior joints including expansion wall joints, floor and pavement joints, curtain walls, panel walls, precast walls, window frames, structural components, dams, spillways, and storm water drains. Substrates include concrete, masonry, aluminum, and wood. Bonds to concrete, masonry, and other materials without a primer. Does not require mixing. Skins overnight and fully cures within a week. Dries smooth and is paintable. Under ideal conditions: Skins over (24 hrs), Functional (3 days), Full Cure (5-7 days). Does not contain a fungicide, but does not generally harbor mold/mildew growth. Longe
From the Manufacturer
SONNEBORN 1025616 10.6OZ ALUMINUM GRAY NP-1 SEALANT ONE PART URETHANE. A one-component high-performance gun-grade moisture-curing polyurethane sealant designed for a wide range of sealing and caulking applications in active exterior joints.
Shirley
Reviewed in the United States on June 30, 2023
I should have listened to the other customers who gave this product a 1 star! I don't know if my tube expired but it was virtually impossible to squeeze out of the tube. Returned all of them and purchased a different brand. Very disappointing!
N M.
Reviewed in the United States on April 24, 2020
I used this to seal a joint on my steel porch where the steel meets the wood along a 30' span. NO LEAKS. Woks great. This stuff sticks and seals on wood, steel, plastic, conctete, stucco, etc. The only thing it won't seal on is air, water, or dirt. LOL. AWESOME product.
J. Gallaugher
Reviewed in the United States on February 28, 2019
I ordered this to seal up a poorly done basement drain following a disaster. I had 2 feet of water in my basement because the house flippers did a crap job. As a result, I was tasked with fixing their mistake. A lot of reviewers had received old product or product that was already solid. Mine arrived fresh and worked to properly seal up the cracks in my cement floor around the new drain that I had installed. The home is over 100 years old so the basement concrete has to be at least that old as well. It had no problems holding and properly sealing everything off. I'd definitely recommend this to anyone needing to do work on porous surfaces because this holds up like a champ.
C. Ray
Reviewed in the United States on May 22, 2018
This is a good urethane chalk. Unlike latex chalks, it does not shrink and crack. As noted by other reviewers, it will dry-up in tube and the customer has no way of knowing if you are buying a fresh product since there is no manufacture date or expiration date.UPDATE: January 11, 2019: I contacted the manufacture to determine if product is within the useable date. They said this product is only good within one year of the manufacture date which can be determined by the (batch code) which is on every tube. The batch code is located at the bottom outside of tube or the inner metal cap. The code usually starts with 3R- and a series of four numbers. The first number represents the year, if it is an 8 it means year 2018. The next three numbers ( 1 thru 365) is the day of the year it was manufactured.I ordered a tube in 2018 that was 7 months old and it was so far gone that it would barely push out of the tube. I thought a would take a chance and ordered another tube this month and it was 9 months old and in worse shape than the previous tube. I was able to get a refund on this last tube.I believe the one year shelf life is only if item is stored at room temperature. If item is stored in a hot warehouse during summer months, the shelf life is more like six months.
Happy Shopper
Reviewed in the United States on December 29, 2018
I've used tons and tons of caulks in my day. This is the only kind that actually lasts. I use it on my roof and outside and it holds up for years without cracking or peeling as long as you make sure you clean the surface from oils. It's the only caulk I use when I need a caulk that works.
W. Hwong
Reviewed in the United States on March 1, 2017
I used it to repair a broken button on a toy because manufacturer refuse to sell me replacement part because somehow I might injure myself replacing a broken button. Anyway I needed something that would bond plastic to tin/aluminum and would hold up to lots of vibration because my child likes to pound on the buttons. I have read that epoxy is not good for fixing things that will experience lots of vibrations. The repair is holding up well. This stuff is thick and I had to use a high thrust ratio (18:1) caulk gun to dispense it. I used the remainder to seal cracks in the patio cement. Very useful.
khancoon
Reviewed in the United States on September 21, 2015
I used it on gutters and for filling large cracks on my concrete. The material retained its shape and does not run like ordinary concrete sealants. Once hardened it still has good flexibility. This product outlast any sealants I've ever used. I love this product and will buy it again
Jody Clark
Reviewed in the United States on August 4, 2014
We used this product on our solid surface deck over 10 years ago and it has held up very well. It never cracked or lost it's bond. Pretty unbelievable, but true! When we ordered this new batch it arrived promptly and was fresh. I should add that it sets up very quickly and is a little harder to work with than caulks in general...but well worth it.
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