can this be used as a slurry to wet/bond a concrete wall cap, to the mortar underneath?

If I understand your question, by itself, no. It is an additive. You can add it to unfortified thin set and comb it to the cap. Let it cure for 24 hours and then place in a setting bed that has also been fortified. The latex will keep it from freezing and as an additive instead of water, there will be less shrink stress.

My red brick chimney has a crack (8 vertical feet). Want to use red morter to patch it. If I pretreat the brick with this will it help the bond?

I want to say yes. The product works. Not sure about mortor application personally, but can't see why it wouldn't. You could always contact their customer service and ask, but I liked the product...

Does it dry white or clear?

Depending on product you are applying it to, usually clear but sometimes slight milky color.

Do you mix this with sand topping cement as replacement for water for thin horizontal applications?

I would check to see if anything is mixed in with what you're using. A lot of 'topping compounds' have a bonding agent mixed in. If its straight cement, it should work, the bonding adhesive sill set it off so I would do a test run first.

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SIKA - SikaLatex R - Concrete Adhesive Adhesive White - Admix for Portland Cement Mortar / Concrete - Resistant to Freeze and Thaw Damage - 1 Gallon (Pack of 1)

Product ID: 740621477

Details

Brand
SIKA
Specific Uses For Product
Amateur
Material
Acrylic
Item Form
Liquid
Special Feature
Resistant to

⚡Ready-to-use, no dilution

🧱500 PSI bond strength

❄️Freeze-thaw resistant

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Description

🧱 Lock in strength, freeze out failure!

UNMATCHED BOND POWER - Boost your concrete’s tensile strength with a robust 500 PSI adhesive grip.
CLEAN DURABLE FINISH - Creates a dense, vapor-permeable surface that stands up to the elements without cracking.
EFFORTLESS APPLICATION - No mixing or diluting needed—just pour and apply for instant project momentum.
WEATHERPROOF DURABILITY - Engineered to resist freeze-thaw cycles, ensuring long-lasting, maintenance-free surfaces.
VERSATILE PRO GRADE FORMULA - Perfect for both DIY enthusiasts and professionals, adaptable as grout adhesive or primer.

SIKA SikaLatex R is a premium acrylic polymer concrete adhesive designed to enhance Portland cement mortar and concrete with a strong 500 PSI bond. Its freeze-thaw resistance ensures durability in harsh climates, while its ready-to-use formula simplifies application for both professionals and DIYers. Ideal for grout adhesion and priming, it delivers a dense, vapor-permeable finish that reduces maintenance and extends the life of your projects.

Specifications

Manufacturer	SIKA
Part number	187782
Item Weight	3.86 Kilograms
Product Dimensions	15.24 x 15.24 x 30.48 cm; 3.86 kg
Size	128 Fl Oz (Pack of 1)
Color	white
Material	Acrylic
Special Features	Resistant to the elements and resists damage from freezing and thawing
Specific Uses For Product	Amateur, Professional
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	15.2 x 15.2 x 30.5 cm

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