can this be used in-between cement joints in a walkway?

Sika’s self-leveling sealant (and backer rod) is the most appropriate product for that situation. The backer rod prevents 3 point adhesion, which you should look up before performing this job. Self-leveling sealant will flow downhill if used on a slope, so the construction sealant might be a better choice in that particular case.

If used to fill gaps between tiles, how does this (polyurethane) compare with epoxy grout ?

This has a silicone texture, I will use it in for the outdoor area. I would not use this to fill gaps between tiles, you should use epoxy grout especially if it's indoor.

Will this adhere to asphalt for the crack between driveway and cement apron? I’d rather use a weatherproof flexible sealant than asphalt cold patch.

It should! This was recommended by the company who raised up three LARGE concrete patio slabs. Unfortunately, the slabs had all moved in different directions, letting water sit up against the foundation. Once raised up, with settling of earth underneath, a couple of the slabs cracked. I used this sealant to fix those cracks. It's remained in place through two Pacific Northwest (wet) winters. It's remained flexible, keeping slab pieces together with no slippage. Good product!

Can I throw some sand on top of horizontal morter cracks after applying the Sikaflex to give it texture?

I think you can. Think of it as a kind of epoxy. If you throw some sand on its surface before it dries, the sand will end up imbedded in it.

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Sikaflex All-Purpose Construction Joint Sealant, White, 10.1 fl oz

Product ID: 20552194

Details

Brand
SIKA
Item Weight
16 ounces
Item dimensions L x W x H
11.5 x 2 x
Material
Polyurethane
Style
Compact

🎯Precision narrow tip for exact application

💧100% waterproof & weatherproof

🛠️ASTM-certified durability

101.61 DT

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Description

💪 Seal smart, live worry-free — the pro’s choice for flawless repairs!

INVISIBLE FINISH - Self-leveling, paintable, and stain-free for seamless repairs.
ELASTIC CRACK RESISTANT - Rubbery texture adapts to joint movement, preventing future damage.
UNMATCHED WEATHERPROOFING - Seal out moisture and protect your home with confidence.
PROFESSIONAL GRADE DURABILITY - ASTM and federal spec certified for long-lasting performance.
EFFORTLESS PRECISION APPLICATION - Narrow tip and compatible with all standard caulking guns for flawless results.

SIKA Sikacryl Ready-Mix Concrete Repair Patch is a one-component, polyurethane-based sealant designed for professional-grade, weatherproof repairs on masonry, wood, concrete, and metal. It offers high elasticity to prevent cracking, meets ASTM and federal standards, and features a narrow tip for precise application. Paintable and stain-resistant, it cures fully in about a week, ensuring durable, invisible seals that protect against moisture infiltration.

Specifications

ASIN	B000RUOH1Q
Best Sellers Rank	#1,890 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #5 in Industrial Joint Sealants
Brand Name	SIKA
Color	White
Compatible Material	Plastic
Customer Reviews	4.6 4.6 out of 5 stars (1,084)
Global Trade Identification Number	00033886000413
Included Components	Multitool Accessory
Item Dimensions	11.5 x 2 x 11.5 inches
Item Form	Liquid
Item Highlight	Repairs spalls and cracks in masonry, Ready-to-use acrylic formula, Durable finish, Easy cleanup and application
Item Type Name	10OZ WHT Const Sealant
Item Weight	16 ounces
Manufacturer	SIKA CORPORATION
Material Type	Polyurethane
Model	90618
Number of Items	1
Number of Packs	1
Part Number	90618
Style Name	Compact
Supported Standards	ASTM C-920, TT-S-00230C, Type II
Surface Recommendation	Door
UPC	033886000413 033886093873
Unit Count	1 Count
Warranty Description	Please reference Manufacture's Product Data Sheet for Warranty Information
Water Resistance Level	Waterproof

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101.61 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

View all Trustpilot reviews