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

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Sold byAmazon NetherlandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal it fast, seal it strong — the pro’s choice for every surface!

UNIVERSAL BONDING POWER - Adheres seamlessly to wood, metal, ceramics, plastics, and more for versatile applications.
RAPID STRENGTH ZERO WAIT - Initial hardening in just 2 hours keeps your projects moving fast.
BUILT TO BRAVE THE ELEMENTS - Weather-resistant formula ensures long-lasting seals even under harsh conditions.
ECO CONSCIOUS CRAFTSMANSHIP - Low VOCs and NSF approval for incidental food contact—safe for your workspace and beyond.
SMOOTH FINISH TOTAL CONTROL - Sandable and paintable for a flawless, professional look every time.

Sika Sikaflex-221 is a premium gray polyurethane sealant and adhesive in a 10.1 fl. oz cartridge, designed for fast curing and permanent elastic seals. It bonds strongly to a wide range of materials including wood, metals, ceramics, and plastics, while offering weather resistance and low VOC emissions. NSF approved for incidental food contact, it’s sandable and paintable, making it ideal for professional-grade sealing and bonding in construction, metalwork, and home improvement projects.

Specifications

ASIN	B01GDN4AAI
Best Sellers Rank	#13,605 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #53 in Silicone Sealers
Brand	SIKA
Brand Name	SIKA
Color	Aluminum Gray
Colour	Aluminum Gray
Compatible Material	Fabric
Container Type	Cartridge
Customer Reviews	4.5 out of 5 stars 2,865 Reviews
Full Cure Time	5-7 Days
Included Components	Sealant
Item Form	Liquid
Item Package Quantity	1
Item Type Name	Sealant
Item Weight	350 Grams
Item form	Liquid
Manufacturer	Sika
Material	Polyurethane
Material Type	Polyurethane
Model	90892
Other Special Features of the Product	Stain resistant
Part Number	90892
Special features	Stain resistant
Specific Uses For Product	Vehicle
Specific uses for product	Vehicle
UPC	033886005104
Unit Count	10.1 Milliliters
Volume	10.1 Fluid Ounces
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

S**.

My favorite multipurpose sealent.

Superior sealent and adhesive. I put this stuff on everything. No terrible smell. Bonds very well to most surfaces.

9.06.2026

A**X

Llego muy raido

Buen sellador excelente para celular y buena. Marca

18.02.2026

K**Y

sikaflex is the BOMB

Great brand always works

27.11.2023

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.

19.05.2026

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Suresh K.

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

4 days ago

Anjali K.

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

1 month ago

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