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.

Polyurethane Sealant And Adhesive

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Description

🔧 Seal Smart, Last Long – The Ultimate Flex Seal for Pros

FAST CURE EFFICIENCY - Tack-free in 3 hours and fully cured in under a week to keep your projects on schedule.
FLEXIBILITY THAT ADAPTS - High elasticity accommodates ±35% joint movement without cracking or tearing.
BUILT TO BRAVE THE ELEMENTS - Urethane formula resists weathering and aging, ensuring long-lasting durability.
CERTIFIED QUALITY YOU CAN TRUST - Meets ASTM C920 and NSF/ANSI 61 standards for reliable, safe performance.
PRECISION SEAL FOR SMALL JOINTS - Perfectly engineered for joints up to 1/2 inch, ideal for windows and door frames.

SIKA Sikaflex-1a is a premium white polyurethane sealant designed for small joints up to 0.5 inches. It offers superior weather and age resistance with high elasticity to handle ±35% joint movement. Certified to ASTM and NSF standards, it cures quickly—tack-free in 3 hours and fully cured within 5 days—making it ideal for windows, door frames, pool decks, and more, delivering professional-grade durability and flexibility.

Specifications

ASIN	B00461KMIY
Best Sellers Rank	#6,725 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #7 in Polyurethane Adhesives #50 in Urethane Adhesives
Brand	SIKA
Brand Name	SIKA
Color	White
Customer Reviews	4.5 out of 5 stars 705 Reviews
Full Cure Time	5 Days
Included Components	Cartridge
Initial Hardening Time	3 Hours
Item Form	Fl
Item Type Name	Adhesive
Item Weight	1 Pounds
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

Reviews

J**B

2.09.2025

S**S

18.03.2026

R**6

1.01.2026

M**.

29.01.2026

L**L

9.02.2026

J**D

8.01.2026

G**S

13.10.2025

K**K

2.06.2024

A**R

7.02.2026

A**N

11.10.2025

G**N

4.12.2024

E**Y

1.08.2025

J**F

3.10.2024

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SAR 98

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In stock

Sold byAmazon KSADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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Polyurethane Sealant & Adhesive

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