SIKA Sikaflex-221 Multi-Purpose Sealant/Adhesive, Gray, 10.1 fl. oz – Fast-Curing Polyurethane, Highly Elastic, Weather-Resistant, Sandable & Paintable, Bonds to Wood, Metal, and Plastics

SIKA Sikaflex-221 Multi-Purpose Sealant/Adhesive, Gray, 10.1 fl. oz – Fast-Curing Polyurethane, Highly Elastic, Weather-Resistant, Sandable & Paintable, Bonds to Wood, Metal, and Plastics

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?

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

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)

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?

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

Product ID: 112797753

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Details

Color
Aluminum Gray
Brand
SIKA
Item Weight
350 Grams
Liquid Volume
10.3 Fluid
Full Cure Time
5-7 Days

⏱️2-hour initial cure

🌧️Weather & water resistant

🛠️Bonds wood, metal & plastic

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Description

🛠️ Seal it fast, seal it smart — the pro’s choice for every project!

FAST CURING POWER - Get a reliable initial set in just 2 hours—no downtime, no delays.
UNIVERSAL BONDING - Seamlessly adheres to wood, metal, plastics, and ceramics for versatile applications.
SAFE FOR CRITICAL USE - NSF-approved for drinking water and food production environments—safety you can trust.
ALL WEATHER DURABILITY - Engineered to withstand rain, seawater, and harsh elements for lasting performance.
FINISH READY FLEXIBILITY - Highly elastic, sandable, and paintable for a flawless, professional finish every time.

Sikaflex-221 is a fast-curing, one-component polyurethane sealant offering superior elasticity and weather resistance. Its versatile formula bonds to multiple surfaces including wood, metal, plastics, and ceramics. NSF-approved for safe use in drinking water and food production, it cures quickly with an initial set in 2 hours and full cure in 5-7 days. Sandable, paintable, and stain resistant, it delivers professional-grade, durable seals ideal for both indoor and outdoor applications.

Specifications

Color	Aluminum Gray
Brand	SIKA
Item Weight	350 Grams
Liquid Volume	10.3 Fluid Ounces
Full Cure Time	5-7 Days
Initial Hardening Time	2 Hours
Item Form	Liquid
Maximum Gap Fill	1 Inches
Surface Recommendation	Metal, Wood, Glass
Temperature Range	40-100 Degrees Fahrenheit
Water Resistance Level	Water Resistant
Number of Items	1
Manufacturer	Sika
UPC	033886005104
Unit Count	1.0 Count
Material	Polyurethane
Model	Sikaflex 221
Item Weight	12.3 ounces
Product Dimensions	12 x 2 x 12 inches
Item model number	SIKA-90892
Manufacturer Part Number	90892
Special Features	Stain resistant

Have a Question? See What Others Asked

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

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

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

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

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