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๐ง Seal it once, seal it right โ the ultimate bond for pros who settle for nothing less.
Sikaflex-221 is a premium, fast-curing polyurethane sealant and adhesive offering a permanent elastic bond. Its multi-substrate compatibility includes metals, plastics, and ceramics, with superior resistance to weather, seawater, and chemicals. NSF-approved for safe use in drinking water and food environments, it comes in a convenient cartridge for precise application. Ideal for professional-grade sealing and bonding tasks requiring durability, flexibility, and long-lasting performance.










| ASIN | B00O9VFLRS |
| Best Sellers Rank | #968 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Polyurethane Adhesives #10 in Urethane Adhesives |
| Brand | SIKA |
| Brand Name | SIKA |
| Color | White |
| Customer Reviews | 4.6 out of 5 stars 2,995 Reviews |
| Global Trade Identification Number | 00338860050980 |
| Included Components | AP Products 017-90891 Sikaflex-221, White |
| Item Form | Paste |
| Item Type Name | AP Products 017-90891 Sikaflex-221, White |
| Item Weight | 10.1 ounces |
| Liquid Volume | 10.1 fluid ounces |
| Manufacturer | SIKA |
| Material Type | Polyurethane |
| Model | 017-90891 |
| Number of Items | 1 |
| Part Number | 0911.1270 |
| Surface Recommendation | Roof, Vent, Pipe |
| UPC | 338860050980 |
| Unit Count | 10.1 Fluid Ounces |
| Water Resistance Level | Waterproof |
T**D
Excellent.
Not inexpensive, but works very well. Sticks well to many different surfaces.
O**A
Perfect for automotive use
I used Sikaflex to adhere a roof wing to the back windshield of my car, and Iโm seriously impressed with how well it worked. The bond is incredibly strong and feels permanent once cured. I let it set for about 24 hours before driving, and even after months of highway speeds and temperature changes, the wing hasnโt budged at all. The application was pretty straightforward, it has a thick, tacky consistency that gives you enough working time to position everything correctly before it starts to set. Iโd recommend taping or clamping the part in place while it cures, because it does take a while to fully harden. Once cured, itโs flexible enough to handle vibration and movement, which is great for automotive use. One thing to note: this stuff is messy. Itโs sticky, and once it gets on your hands or paint, itโs not easy to remove. Wear gloves, mask off surrounding areas, and have some cleaner or mineral spirits ready. Overall, Sikaflex delivered exactly what I needed, a strong, weatherproof, and vibration resistant bond thatโs holding my roof wing securely in place. Itโs not the cheapest adhesive, but itโs worth it for the strength and reliability.
D**C
quality product - glad I found it
used this for a repair that needed waterproof and permanent - this applied on easy and so far 100% resolved issue! I used AI to recommend product off amazon after uploading to AI a photo of the damage and this is what it recommended.
J**R
Great caulk!
This stuff is robust. Itโs easy to apply and finish, looks great and holds up to standing water (so far). On the pricier side but you get what you pay for, it should hold up!
J**N
Great, but now past the expiration date
Product works great on my RV, but this last tube I purchased had an โexpirationโ date thatโs picky 3 months from the time of delivery. Iโm not sure what happens after it expires, but why would Amazon send something like this so close to the expiration date? I keep a tube with me for RV repairs.
A**Z
best adhesive in market
really good adhesive/sealant. I have used several other cheaper amazon brands and it lays significantly smoother and like a thick cake frosting consistency - it also hardens and connects with much stronger bond. Highly recommend using this and paying the price over the cheaper stuff out there
J**N
Works on everything but roof, because it is non leveling.
The go to for non leveling vertical, and horizontal joints on an rv. Not for roof.
R**E
Professional grade sealant.
Before I retired, my company was excellent at ceiling water leaks. Sika was the best product in areas exposed to ultraviolet light. I recently used it when installing a new skylight on my RV. Knowing that itโs difficult to clean up, I blue taped all edges and had rags with solvent nearby. The job went very smoothly, I was impressed how easily it adhered and spread evenly. Cleanup turned out to be no problem for me.
H**M
Very good
Very good
A**X
Llego muy raido
Buen sellador excelente para celular y buena. Marca
J**S
Great stuff
Use this on my Airstream, works great.
R**S
Heavy duty sealant
Itโs SIKA, it does the job right. Replacing the Water heater on RV and original install got over enthusiastic with the opening size. Used lots of SIKA to fill gap before applying the butle tape and the retaining ring to make sure no water leaks from rain
K**Y
sikaflex is the BOMB
Great brand always works
Trustpilot
5 days ago
1 month ago