What is the expiration date of these? They are difficult to use if beyond expire date.

I would not use this beyond its expiration date. Smarter to get fresh caulk as old caulk loses adhesion. This stuff is Soooo much better than anything else. But it needs to sit for 6-7 days before exposure to water in the bath or kitchen or paint anywhere else.

After I have filled the cracks can I apply more sikaflex on top of the existing sikaflex...Will it bond to itself?

Yes and no. A cured bond break will exist, but if you need to increase the fill of the caulkable gap, no harm will be created. You can reactive the existing caulk with a little acetone. BUT if it's a vertical fill, don't do it! You'll have a mess in your hands and everywhere else....

I need to seal stainless steel to concrete in an underwater pool setting with chlorine, is this the stuff to use?

I haven't had that kind of use for it, but this caulk seems very durable, and sticks pretty aggressively to everything.

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Polyurethane Sealant & Adhesive

Product ID: 18784330

Details

Brand
SIKA
Item Weight
16 ounces
Item dimensions L x W x H
2 x 2 x 12
Material
Polyurethane
Style
polyurethane

🌀±35% joint movement elasticity

⏱️3-hour tack-free time

🌧️Weather & age resistant

€ 51.23

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Description

🔧 Seal smart, last longer — the pro’s choice for flawless joints!

FLEXIBILITY THAT LASTS - High elasticity accommodates ±35% joint movement without cracking or tearing.
FAST TRACK YOUR PROJECTS - Quick curing with tack-free touch in just 3 hours—get the job done faster and smarter.
PRECISION FOR SMALL JOINTS - Self-leveling formula perfect for joints up to 1/2 inch deep—ideal for windows and door frames.
BUILT TO BRAVE THE ELEMENTS - Urethane-based sealant resists weathering and aging, ensuring long-lasting durability outdoors.
CERTIFIED QUALITY ASSURANCE - Meets ASTM C920 and NSF/ANSI 61 standards for reliable, safe performance.

SIKA Sikaflex-1a is a premium, self-leveling polyurethane sealant designed for small joints up to 1/2 inch deep. It offers superior weather and age resistance, high elasticity to handle ±35% joint movement, and fast curing with a tack-free time of 3 hours. Certified to ASTM and NSF standards, it’s perfect for windows, door frames, and concrete applications, delivering durable, flexible, and waterproof sealing that professionals trust.

Specifications

ASIN	B00461KMIY
Best Sellers Rank	#5,186 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #6 in Polyurethane Adhesives #35 in Urethane Adhesives
Brand Name	SIKA
Color	White
Compatible Material	Concrete
Customer Reviews	4.4 4.4 out of 5 stars (756)
Included Components	Cartridge
Item Dimensions	2 x 2 x 12 inches
Item Form	Fl
Item Type Name	Adhesive
Item Weight	16 ounces
Manufacturer	Sika
Material Type	Polyurethane
Model	91017
Number of Items	1
Number of Packs	1
Part Number	91017
Style Name	polyurethane
Surface Recommendation	Concrete
UPC	033886002752
Unit Count	1 Count
Water Resistance Level	Waterproof

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€ 51.23

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered 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 Austria.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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