---
product_id: 519438244
title: "Sika Sikaflex-221, Gray, multi-purpose sealant/adhesive, polyurethane fast curing sealant, 10.1 fl. oz Cartridge"
brand: "sika"
price: "€ 34.91"
currency: EUR
in_stock: true
reviews_count: 6
category: "Sika"
url: https://www.desertcart.de/products/519438244-sika-sikaflex-221-gray-multi-purpose-sealant-adhesive-polyurethane-fast
store_origin: DE
region: Germany
---

# Fast curing 1-C polyurethane Weather-resistant durability Bonds multiple substrates Sika Sikaflex-221, Gray, multi-purpose sealant/adhesive, polyurethane fast curing sealant, 10.1 fl. oz Cartridge

**Brand:** sika
**Price:** € 34.91
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal smart, last long — the pro’s choice for flawless finishes!

## Quick Answers

- **What is this?** Sika Sikaflex-221, Gray, multi-purpose sealant/adhesive, polyurethane fast curing sealant, 10.1 fl. oz Cartridge by sika
- **How much does it cost?** € 34.91 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/519438244-sika-sikaflex-221-gray-multi-purpose-sealant-adhesive-polyurethane-fast)

## Best For

- sika enthusiasts

## Why This Product

- Trusted sika brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Universal Adhesion:** Bonds wood, metals, ceramics, plastics & more with high strength
- • **All-Weather Warrior:** Resists weathering and UV, perfect for outdoor and high-exposure use
- • **Rapid, Reliable Seal:** Cures quickly on humidity exposure for permanent elastic bonds
- • **Eco-Conscious Formula:** Lower VOCs and NSF approved for incidental food contact
- • **Finish-Ready Flexibility:** Can be sanded and painted to blend seamlessly with your project

## Overview

Sikaflex-221 is a premium, fast-curing 1-component polyurethane sealant and adhesive designed for permanent elastic seals with high adhesive strength. It bonds effectively to a wide range of materials including wood, metals, ceramics, and plastics, while offering excellent weather resistance and low VOC emissions. NSF approved for incidental food contact, it can be sanded and painted, making it ideal for professional-grade sealing and bonding applications in construction, automotive, and general metalwork.

## Description

Sikaflex-221 is a high-quality multi-purpose non-sag 1-c polyurethane sealant/adhesive that cures on exposure to atmospheric humidity to form a durable elastomer. Sikaflex-221 bonds well to a wide variety of substrates and is suitable for making permanent elastic seals of high adhesive strength. Suitable substrate materials are wood, metals, metal primers and paint coatings (2-c systems), ceramic materials and plastics.

Review: As advertised - Good quality
Review: Bought the grey for my RV which sits out year round, lots of exposure to Denver sun and weather as well as traveling vibration and movement. After using ChatGPT, it recommended this sealant, from other brands... can I trust an AI, we will see. First the product is very hard to squeeze from the caulk tube, (as mentioned from other users.) Second, I used painters tape to control the application in a straight line. The product is super messy, very tacky and requires to be spread, and smoothed ONLY ONCE. Three, Removing the tape was problematic, meaning the excess would string from the tape, then sometimes depending on the thickness, it overlapped backwards onto the newly applied sealant. I've worked with other products which have lost their effectiveness in a year, so another investment in this sealant is still out for a review a year from now. For as much as I think this might be the best alternative, the finished appearance suffers from previous applications of other products. Something I didn't purchase was the Sika Cleaner 226 or Aktivator-205 for Gel Coat finish... I did use the Isopropyl alcohol for clean up prior to application (which worked good) as well as after on my hands. Last, Chat said to not move the vehicle for 24 hours and product cures in 5-7 days .Also noted its cured by moisture in the air, how much? Denver is dry, but other western states are dryer.

## Features

- Highly elastic and multi-purpose, Sikaflex-221 is suitable for making permanent elastic seals of high adhesive strength.
- PERFORMANCE: 1-C formulation. NSF approved for drinkable water and incidental food contact. Can be sanded and painted.
- DURABILITY: Resistant to weathering exposure. Lower VOC’s.
- SUPPORTS: Bonds well to a wide variety of substrates: wood, metals, metal primers and paint coatings (2-c systems), ceramic materials and plastics.
- APPLICATION: Used for the panel sealing and bonding, root base sealing, nacelle sealing, tower sealing, installation & perimeter sealing, general metal construction sealing, metal panels, roofing, flooring bonding, cabinets, flooring and trim.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01GDN4AAI |
| Best Sellers Rank | #19,237 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #127 in Silicone Sealers |
| Brand | SIKA |
| Customer Reviews | 4.5 4.5 out of 5 stars (264) |
| Date First Available | 23 February 2023 |
| Item Weight | 350 g |
| Item model number | SIKA-90892 |
| Manufacturer | Sika |
| Manufacturer Part Number | 90892 |
| Model | Sikaflex 221 |
| Product Dimensions | 30.48 x 5.08 x 30.48 cm; 350 g |
| Special Features | Stain resistant |

## Product Details

- **Brand:** SIKA
- **Colour:** Aluminum Gray
- **Full cure time:** 5-7 Days
- **Item weight:** 350 Grams
- **Liquid volume:** 10.3 Fluid Ounces

## Images

![Sika Sikaflex-221, Gray, multi-purpose sealant/adhesive, polyurethane fast curing sealant, 10.1 fl. oz Cartridge - Image 1](https://m.media-amazon.com/images/I/51dlzDcXfvL.jpg)

## Questions & Answers

**Q: Would this work as a sealant on the abs fitting that inserts into the rv poly holding tank outlet and has a hose clamp?**
A: Re UV protection.  It is widely used on RV roofs so presumably is at least UV resistant.  That said, I've found that it lasts only about 3 years on the roof of an RV that sits out in the sun.  It is necessary to check it annually and rough up the existing material and add more where cracks have developed.  The cracks are in part from expansion and contraction of the underlying parts, but do work their way up through the Sikaflex 221 and result in a leak of the crack is not repaired.  I inspect my RV roof annually and usually need to do some repair to the older Sikaflex-221.

**Q: Is this suitable for bonding a window into an aluminium u-channel on an rv? also, can i remove it if need be? thank you**
A: Precisely the application to which I put the material to use in - sealing RV windshield to aluminum and fibreglass.  Has worked flawlessly for 4 years.  Easy to remove before cure; extremely difficult to fully remove after cure.

**Q: Can someone verify if inventory issue fixed, ordered two blacks and received both white (stamped inside bottom of tube)**
A: I have always received the correct color ordered (fulfilled by Amazon).  Contact the Seller directly (or whoever is fulfilling an order on their behalf), to confirm inventoried colors.  I would request a refund for any product that is not what you ordered.

**Q: Do you recommend this for filling in concrete floor cracks? Will it self-level?**
A: Not sure on concrete it may hold up but it will not self-level

## Customer Reviews

### ⭐⭐⭐⭐⭐ As advertised
*by A***R on 10 April 2025*

Good quality

### ⭐⭐⭐⭐ Review
*by A***R on 20 October 2025*

Bought the grey for my RV which sits out year round, lots of exposure to Denver sun and weather as well as traveling vibration and movement. After using ChatGPT, it recommended this sealant, from other brands... can I trust an AI, we will see. First the product is very hard to squeeze from the caulk tube, (as mentioned from other users.) Second, I used painters tape to control the application in a straight line. The product is super messy, very tacky and requires to be spread, and smoothed ONLY ONCE. Three, Removing the tape was problematic, meaning the excess would string from the tape, then sometimes depending on the thickness, it overlapped backwards onto the newly applied sealant. I've worked with other products which have lost their effectiveness in a year, so another investment in this sealant is still out for a review a year from now. For as much as I think this might be the best alternative, the finished appearance suffers from previous applications of other products. Something I didn't purchase was the Sika Cleaner 226 or Aktivator-205 for Gel Coat finish... I did use the Isopropyl alcohol for clean up prior to application (which worked good) as well as after on my hands. Last, Chat said to not move the vehicle for 24 hours and product cures in 5-7 days .Also noted its cured by moisture in the air, how much? Denver is dry, but other western states are dryer.

### ⭐⭐⭐⭐ Review
*by G***L on 14 November 2025*

The product works just as advertised, but unopened tubes don't have a good shelf life, in my opinion. I tried a new un opened, un damaged tube that I have had for 1 year and it was all hardened in the tube.

## Frequently Bought Together

- Sika Sikaflex-221, Gray, multi-purpose sealant/adhesive, polyurethane fast curing sealant, 10.1 fl. oz Cartridge
- Dicor 551LSB-1 HAPS-Free NON-Leveling Lap Sealant - 10.3 Oz, Black, Secure, Ideal for RV Roofing, Maintenance, Repair, Appliance Application
- Dicor BT-1834-1 Butyl Seal Tape - 1/8" x 3/4" x 30' Repair Tape for RV, Trailer, Motorhome, Window, and Vent Sealing

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*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-02-19*