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

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Sika Sikaflex-221, Gray, multi-purpose sealant/adhesive, polyurethane fast curing sealant, 10.1 fl. oz Cartridge

Product ID: 519438244

Details

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

⚡Fast curing in 2 hours

🌦️Weather-resistant durability

🛠️Bonds to wood, metal, plastic & ceramic

£35.75

Duties & taxes included

In stock

Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

ECO SMART SEALANT - Low VOC formula approved for drinkable water and incidental food contact
UNIVERSAL BONDING POWER - Adheres seamlessly to diverse surfaces including wood, metal, plastics, and ceramics
FINISH READY FLEXIBILITY - Can be sanded and painted to match your design vision perfectly
RAPID STRENGTH ZERO WAIT - Cures quickly in just 2 hours for fast project turnaround
BUILT TO BRAVE THE ELEMENTS - Engineered for superior weather resistance and long-lasting seals

Sika Sikaflex-221 is a premium gray polyurethane sealant/adhesive designed for professional-grade, permanent elastic seals. It cures rapidly within 2 hours, bonds strongly to a wide range of materials including wood, metal, plastics, and ceramics, and offers excellent weather resistance. With NSF approval for incidental food contact and low VOC emissions, it’s an eco-conscious solution that can be sanded and painted for a flawless finish. Ideal for construction, panel sealing, roofing, and general metalwork, Sikaflex-221 ensures durable, high-performance results every time.

Specifications

ASIN	B01GDN4AAI
Best Sellers Rank	#15,968 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #74 in Silicone Sealers
Brand Name	SIKA
Color	Aluminum Gray
Customer Reviews	4.5 4.5 out of 5 stars (2,962)
Full Cure Time	5-7 Days
Included Components	Sealant
Initial Hardening Time	2 Hours
Item Form	Liquid
Item Type Name	Sealant
Item Weight	350 Grams
Liquid Volume	10.3 Fluid Ounces
Manufacturer	Sika
Material Type	Polyurethane
Maximum Gap Fill	1 Inches
Model	SIKA-90892
Number of Items	1
Number of Packs	1
Part Number	90892
Surface Recommendation	Metal, Plastic, Wood, Ceramic
Temperature Range	40-100 Degrees Fahrenheit
UPC	033886005104
Unit Count	10.1 Milliliters
Water Resistance Level	Water Resistant

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