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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SIKA Sikaflex Construction Sealant - White, All-Purpose Polyurethane for Joints 1/2" or Smaller - 10.1 fl. oz - Weatherproof, High Elasticity, Paintable, Strong Adhesion

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

🎨Paintable & stain-free finish

🔒High elasticity & strong adhesion

🌧️Weatherproof & waterproof

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€ 32.24

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Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal smart, live worry-free — the last sealant your projects will ever need!

CERTIFIED QUALITY - Meets ASTM and federal specs for trusted, professional-grade performance.
UNBREAKABLE BONDS - Polyurethane formula ensures tight, flexible seals that resist cuts and tears.
INVISIBLE PROTECTION - Self-leveling, paintable sealant blends seamlessly with any surface.
BUILT FOR ALL WEATHER - Seals out moisture from brick, wood, concrete, and metal—rain or shine.
EFFORTLESS APPLICATION - 10.1 fl oz cartridge fits standard guns for precise, mess-free sealing.

Sikaflex Construction Sealant is a premium white polyurethane sealant designed for joints 1/2" or smaller. It offers superior elasticity and adhesion to create durable, weatherproof seals on multiple materials including brick, wood, and metal. Paintable and self-leveling, it blends invisibly while meeting rigorous ASTM and federal standards. Packaged in a 10.1 fl oz cartridge, it’s easy to apply with most caulking guns, making it ideal for both pros and DIYers aiming for long-lasting, professional results.

Specifications

ASIN	B000RUOH1Q
Best Sellers Rank	#2,467 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Industrial Joint Sealants
Brand Name	SIKA
Color	White
Compatible Material	Plastic
Customer Reviews	4.6 4.6 out of 5 stars (1,028)
Global Trade Identification Number	00033886000413
Included Components	Multitool Accessory
Item Dimensions	11.5 x 2 x 11.5 inches
Item Form	Liquid
Item Type Name	10OZ WHT Const Sealant
Item Weight	16 ounces
Manufacturer	SIKA CORPORATION
Material Type	Polyurethane
Model	90618
Number of Items	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	1.0 Count
Warranty Description	Please reference Manufacture's Product Data Sheet for Warranty Information
Water Resistance Level	Waterproof

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