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🔧 Seal Smart, Last Long – The Ultimate Flex Seal for Pros
SIKA Sikaflex-1a is a premium white polyurethane sealant designed for small joints up to 0.5 inches. It offers superior weather and age resistance with high elasticity to handle ±35% joint movement. Certified to ASTM and NSF standards, it cures quickly—tack-free in 3 hours and fully cured within 5 days—making it ideal for windows, door frames, pool decks, and more, delivering professional-grade durability and flexibility.










| ASIN | B00461KMIY |
| Best Sellers Rank | #6,325 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #7 in Polyurethane Adhesives #42 in Urethane Adhesives |
| Brand | SIKA |
| Brand Name | SIKA |
| Color | White |
| Customer Reviews | 4.5 out of 5 stars 709 Reviews |
| Full Cure Time | 5 Days |
| Included Components | Cartridge |
| Initial Hardening Time | 3 Hours |
| Item Form | Fl |
| Item Type Name | Adhesive |
| Item Weight | 1 Pounds |
| Liquid Volume | 10.1 Fluid Ounces |
| Manufacturer | Sika USA |
| Material Type | Polyurethane |
| Maximum Gap Fill | 0.5 Inches |
| Model | 91017 |
| Number of Items | 1 |
| Part Number | 91017 |
| Surface Recommendation | Concrete |
| Tensile Strength | 175 Pounds Per Square Inch |
| UPC | 033886002752 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Waterproof |
2**B
Excellent product but incorrect description
I did not even attempt to use the Sikaflex until over a year after I purchased it, and then discovered that it expired one week after I bought it. So, it was over a year past expiration. But to my surprise, it was still in good condition! Very tough, strong adhesion, but Amazon’s description says it’s self-leveling, which it is not. I used it to bond shoe soles, seal leaks, and a tough caulking compound. A very good product that I will probably buy again.
J**B
Great stuff for Pool Decking
Great stuff. I used it to seal seam between the concrete deck and my pool tiles. Worked great. Not sure why they say it's self-leveling because it stayed in place on an overhead application. I used painters' tape on the vertical tiles to get a nice clean line.
J**D
Excellent for Superior Walls!
Excellent for sealing Superior Walls as they age. Worked perfectly!
M**.
Easy to install, good pliable use on my floor.
I used this product to fill the cracks on my garage floor. It works good. So far it has been standing up to daily wear and tear of the floor as normal. I am very happy 😊.
S**L
Excellent outdoor window frame sealant
Just what I needed to repair outdoor window frames. Easy to apply but I would recommend looking up the best way to apply a sealant so that you have a very neat and clean application. Sealant takes about 24 to 48 hours to fully dry and cure. Very pleased with the sealant and the results.
S**S
Great product
This product is amazing. I sprinkled ittle sand and it blended completely with my driveway. Cracks are all gone
L**L
Seems like good stuff
Garage floor and driveway apron started to settle apart I filled the crack with this to prevent water intrusion and further erosion. Went in nice. Looks good. Seems to be a good seal. I wire wheeled it prior to application. We will see if the bond holds up over time.
K**K
Not self leveling!
Incorrect product description. After applying the product, I realized that it is not self leveling and had to be tooled and shaped which made a huge mess. Contacted customer service and the agent has not a clue what self leveling even means. She just wants to give me $5 for my troubles and issue a return. Why would Amazon make a customer return a used tube of sealant that is open? It will make a huge mess during shipping and will just end up in the landfill. Not to mention the hassle. Not the best way to keep costs down and customers happy Amazon. Fix the description so that people are buying the correct item in the first place. It’s like trying to get a customer to rip out wall paper and return it just for the sake of returning. That is not customer service, but again, most of the agents have zero common sense, they don’t know the products and just read the same script whether you’re returning an already applied sealant or a modem.
A**R
Works as expected.
So far it survived winter.
A**N
Likely the best Sika product
This sika is probably the best one out there. Bought 5 of these, enough to seal a lot of cement gaps and cracks on my driveway. I'm in BC Canada and it rains quite a lot. I'm finding this product attaches itself to the surrounding concrete better than other sealants and creates a solid barrier to prevent water from getting thru. I got the dark gray colour and it blends well with existing concrete. 5 of 5 stars!
G**N
Buen producto
Me ha funcionado muy bien, para sellar lugares donde se filtraba el agua
E**Y
Great for the RV
Great for the roof of the RV and sunroom. Easy to work with.
J**F
Excelente producto
Cumplió con mis espectativas
Trustpilot
2 weeks ago
3 weeks ago