Sika Sikaflex-221 - Aluminum Gray - Multi-Purpose Polyurethane sealant/Adhesive - Creates Permanent Elastic Seal - Sandable/paintable - Non-Corrosive - 10.1 fl. Oz (Pack of 24)
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Sika Sikaflex-221 - Aluminum Gray - Multi-Purpose Polyurethane sealant/Adhesive - Creates Permanent Elastic Seal - Sandable/paintable - Non-Corrosive - 10.1 fl. Oz (Pack of 24)

4.5/5
Product ID: 615004640
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Details

  • Color
    Aluminum Gray
  • Brand
    SIKA
  • Liquid Volume
    10.3 Fluid
  • Item Form
    Liquid
  • Surface Recommendation
    Metal Wood
Long-lasting age resistance
💧Water & chemical resistant
🔧Multi-surface bonding power

Description

🔗 Seal the deal with confidence—where durability meets precision!

  • CUSTOM FINISH READY - Sandable and paintable for a perfect, professional look that blends seamlessly with your design.
  • ENDURING PERFORMANCE - Formulated to resist aging, seawater, acids, and caustics—built to last through every challenge.
  • UNIVERSAL BONDING MASTERY - Seamlessly adheres to metals, plastics, ceramics, and wood for versatile project success.
  • SAFE FOR CRITICAL ENVIRONMENTS - NSF-approved for drinking water and food production—trust in a non-toxic, non-corrosive seal.
  • EFFORTLESS PRECISION APPLICATION - Compatible with electric, pneumatic, and manual guns for flawless, mess-free sealing every time.

Sika Sikaflex-221 is a premium aluminum gray, one-component polyurethane sealant and adhesive designed for permanent elastic seals. It bonds effortlessly to metals, plastics, ceramics, and wood, offering superior resistance to aging, seawater, and chemicals. NSF-approved for safe use in drinking water and food environments, it comes in a 10.1 fl. oz cartridge compatible with various application guns. Sandable and paintable, this multi-purpose sealant ensures a flawless, durable finish for professional-grade projects.

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Specifications

ColorAluminum Gray
BrandSIKA
Liquid Volume10.3 Fluid Ounces
Item FormLiquid
Surface RecommendationMetal, Wood, Glass
Water Resistance LevelWater Resistant
Number of Items24
ManufacturerSika
Global Trade Identification Number10033886005101
Unit Count24.0 Count
MaterialPolyurethane
Item Weight23.3 pounds
Product Dimensions12 x 8 x 12 inches
Item model number90892
Manufacturer Part Number90892

Reviews

4.5

All from verified purchases

J**F

Probably the best stuff out there.

Best adhesive/sealer that I’ve ever used. I’ve used many brands of polyurethane sealant, but this one flows better and cures more flexible than other urethane sealers. I’ve used it for ceiling tiles,, shiplap,on walls, backsplashes, sealing exterior window and door frames. Holds up to weather without shrinking.

P**N

SikaFlex 221

Sikaflex 221 exceeded my expectations. It’s incredibly versatile, adheres to a wide range of materials, and cures to a strong, flexible seal that holds up under tough conditions. I used it for sealing my little project little tikes and it performed flawlessly—no leaks, no cracks, and it’s weather-resistant. Application was smooth and cleanup was easy. Whether you're working on automotive, construction, or DIY projects, this is a must-have product. Highly recommended!

M**R

This is great stuff - Apply with care

I used this to reseal the inner framing of a cargo van to the shell where the original manufacture bonding broke away. I left the original foam looking bonding in place. It was still firmly attached to the framing. The Sikaflex bonded to both the original foam and the the steel van shell. It helped reduce some of the vibration and noise. I allowed 6-7 days cure time. BE CAREFUL TO GET AS LITTLE ON YOU HANDS AS POSSIBLE. Clean it off your skin as soon a possible. Even after half an hour or so it is hard to remove and remain on your hands for a week or so.This a high quality strong elastic sealer adhesive. Once dry and cured its strong. Relatively low odor. Highly recommend.

T**H

Works well.

Needed for rv windshield leak.Worked well.Time will tell for long term effectiveness.

B**K

About the best sealant/adhesive, period.

If you need a really tough adhesive/sealant-this is it. It is a little hard to work with, but is about the best sealant I've ever used. Generally used for RV, boats, but i used it to repair the failing gasket on my refrigerator door, and it sealed it perfectly. Make sure whatever you are applying it to you intend to not take apart-it dries to very strong seal. it can be removed with a sharp utility knife or similar-but this, unlike so many of these products, is crappy water based which i generally find pretty useless for anything but gluing paper together. Even silicon-based caulks do not seal and last like this stuff. And it is equally strong indoors or out. The days of solid construction adhesive are over-except for this.

E**R

The One to Rule Them All

This is the go-to for most RV sealing applications. Use this, skip silicone. You’ll be happy you trusted me on this one. It’s easy to use and clean up, and application is a breeze.

J**S

Great sealant!

People complaining about the wrong color or broken package is not a true reflection of the product. Amazon offers free returns, just return the wrong color and reorder.Anyways I used this for repairing a small crack in my roof flashing. Product went on easily and instantly bonded. Found it through recommendations through reddit about roof repair. It was easy to squeeze out of the tube (use a caulk gun with adjustable leverage as I had no issues at all), and was easy to spread and apply. Dried pretty quickly. Unsure about the longevity of the product but initial impressions I am very happy with it.

M**N

Usually good , this one mostly dried up

Past purchases have been good, this one the product was very thick, almost dried up but i only used a little to stop a lesk, guess ill throw the rest away

Common Questions

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

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€ 548.88

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

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