Would this work as a sealant on the abs fitting that inserts into the rv poly holding tank outlet and has a hose clamp?

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.

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

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.

Can someone verify if inventory issue fixed, ordered two blacks and received both white (stamped inside bottom of tube)

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.

Do you recommend this for filling in concrete floor cracks? Will it self-level?

Not sure on concrete it may hold up but it will not self-level

Sika Sikaflex 221 Gray Multi Purpose Sealant Adhesive Polyurethane Fast

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

£29.99

Duties & taxes included

In stock

Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to UK.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Description

🔧 Seal it fast, seal it strong — the pro’s choice for lasting bonds!

ULTRA FAST CURE TIME - Get durable seals in just 5-7 days, speeding up your projects without compromise.
ECO CONSCIOUS FORMULA - Lower VOCs and NSF approval for drinkable water contact—safe for you and the environment.
MULTI PURPOSE MASTERY - Perfect for panel sealing, roofing, flooring, cabinetry, and vehicle repairs—one tube, endless solutions.
UNIVERSAL BONDING POWER - Seamlessly adheres to wood, metals, ceramics, plastics, and more for versatile applications.
WEATHERPROOF STAIN RESISTANT - Built to withstand harsh weather and resist stains, keeping your work flawless over time.

Sikaflex-221 is a premium gray polyurethane sealant/adhesive in a 10.1 fl. oz cartridge, designed for fast curing and permanent elastic seals. It bonds reliably to a wide range of materials including wood, metal, ceramics, and plastics, while offering weather resistance, stain protection, and NSF approval for incidental food contact. Ideal for professional-grade sealing and bonding in construction, automotive, and general metalwork.

Specifications

ASIN	B01GDN4AAI
Best Sellers Rank	#16,072 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #61 in Silicone Sealers
Brand	SIKA
Brand Name	SIKA
Color	Aluminum Gray
Colour	Aluminum Gray
Customer Reviews	4.5 out of 5 stars 2,895 Reviews
Full Cure Time	5-7 Days
Full cure time	5-7 Days
Included Components	Sealant
Initial Hardening Time	2 Hours
Initial hardening time	2 Hours
Item Form	Liquid
Item Type Name	Sealant
Item Weight	350 Grams
Item weight	350 Grams
Liquid Volume	10.3 Fluid Ounces
Liquid volume	10.3 Fluid Ounces
Manufacturer	Sika
Material Type	Polyurethane
Maximum Gap Fill	1 Inches
Model	SIKA-90892
Number of Items	1
Part Number	90892
Surface Recommendation	Metal, Wood, Glass
Temperature Range	40-100 Degrees Fahrenheit
UPC	033886005104
Unit Count	10.1 Milliliters
Water Resistance Level	Water Resistant

Reviews

D**B

The best

Best adhesive sealant I've ever used. I've gone through many tubes of this. It's never let me down except when removing it lol!

3.06.2026

A**R

As advertised

Good quality

10.04.2025

H**M

Very good

3.11.2023

A**X

Llego muy raido

Buen sellador excelente para celular y buena. Marca

18.02.2026

R**S

Heavy duty sealant

It’s 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

13.06.2026

K**Y

sikaflex is the BOMB

Great brand always works

27.11.2023

T**D

Excellent.

Not inexpensive, but works very well. Sticks well to many different surfaces.

24.06.2026

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Khalid Z.

Great experience from order to delivery. Highly recommended!

1 week ago

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

View all Trustpilot reviews

£29.99

Duties & taxes included

In stock

Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to UK.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago