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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Sikaflex-1a Sealant, 10.1 fl oz, White – Premium Adhesive for Small Joints, Weather & Age Resistant, High Elasticity, Ideal for Windows, Door Frames & More

Product ID: 18784330

Details

Brand
SIKA
Color
White
Full Cure Time
5 Days
Item Weight
16 ounces
Liquid Volume
10.1 Fluid

🌀±35% joint movement elasticity

🌦️weather & age resistant

🛠️0.5 in max joint depth

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Description

🔧 Seal Smart, Last Long – The Ultimate Flex for Your Joints!

FAST CURE EFFICIENCY - Tack-free in just 3 hours, fully cured in under a week—get your projects done faster without compromising quality.
WEATHERPROOF DURABILITY - Urethane-based formula resists harsh weather and aging, keeping your projects pristine year-round.
CERTIFIED QUALITY ASSURANCE - Meets ASTM C920 and NSF/ANSI 61 standards, guaranteeing safety and reliability for potable water applications.
ELASTICITY THAT MOVES WITH YOU - Accommodates ±35% joint movement without cracking or tearing—flexibility that lasts.
PRECISION SEAL FOR SMALL JOINTS - Perfectly engineered for joints up to 1/2 inch, ensuring a flawless finish on windows, door frames, and flashing.

Sikaflex-1a is a premium white polyurethane sealant designed for small joints up to 0.5 inches. It offers superior weather and age resistance, high elasticity accommodating ±35% joint movement, and fast curing times with a tack-free surface in 3 hours. Certified to meet rigorous federal and Canadian standards, it’s ideal for windows, door frames, and other interior/exterior applications requiring durable, waterproof sealing.

Specifications

ASIN	B00461KMIY
Best Sellers Rank	#4,442 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #7 in Polyurethane Adhesives #42 in Urethane Adhesives
Brand Name	SIKA
Color	White
Customer Reviews	4.5 4.5 out of 5 stars (721)
Full Cure Time	5 Days
Included Components	Cartridge
Initial Hardening Time	3 Hours
Item Form	Fl
Item Type Name	Adhesive
Item Weight	16 ounces
Liquid Volume	10.1 Fluid Ounces
Manufacturer	Sika USA
Material Type	Polyurethane
Maximum Gap Fill	0.5 Inches
Model	91017
Number of Items	1
Part Number	91017
Surface Recommendation	Concrete
Tensile Strength	175 Pounds Per Square Inch
UPC	033886002752
Unit Count	1.0 Count
Water Resistance Level	Waterproof

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$38.75

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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