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

🌦️Weather & age resistant

🛠️Max 1/2-in. joint depth

R817

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Description

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

ELASTICITY THAT ADAPTS - Accommodates ±35% joint movement without cracking or tearing—flexibility that lasts.
FAST CURING EFFICIENCY - Tack-free in just 3 hours, fully cured within a week—get your projects done faster.
PRECISION FOR SMALL JOINTS - Perfectly engineered for joints up to 1/2 inch deep, ensuring a flawless seal every time.
BUILT TO BRAVE THE ELEMENTS - Urethane formula resists weathering and aging, keeping your projects pristine season after season.
CERTIFIED QUALITY ASSURANCE - Meets ASTM C920 and NSF/ANSI 61 standards for trusted, reliable performance.

SIKA Sikaflex-1a is a premium white polyurethane sealant designed for small joints up to 1/2 inch deep. It offers superior weather and age resistance with high elasticity, accommodating ±35% joint movement without damage. Certified to meet ASTM C920 and NSF/ANSI 61 standards, it cures quickly with a tack-free time of 3 hours and full cure within a week, making it ideal for windows, door frames, and concrete applications both indoors and outdoors.

Specifications

ASIN	B00461KMIY
Best Sellers Rank	#5,456 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #7 in Polyurethane Adhesives #47 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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R817

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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