Is this a good product to repair hairline cracks in stucco?

Yes. I used it on a foundation and it worked great!

Is this good for sloped concrete pads?

Depends on how severe the slope is but it should work otherwise.

Can you use it to reset a loose fireplace hearth stone?

For that I would use a construction adhesive, not a caulk.

Can you use this on indoor concrete walls?

I've used this product on inside concrete cinder block walls with no problem. I like its textured consistency. Know that this product will break down over time when exposed to direct sunlight like a west or south facing concrete outside wall.

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Red Devil 0646 Concrete & Mortar Repair

Product ID: 515820823

Details

Brand
Red Devil
Colour
Gray
Item Form
Strip
Item Weight
1.88 Pounds
Liquid Volume
10.1 Fluid

⚡Fast curing formula

💧Water-cleanup ease

🛠️Flexible & durable repair

€ 101.38

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Description

🧱 Fix it fast, fix it smart—Red Devil keeps your concrete flawless!

RAPID REPAIR ACTION ⚡ - Special formula sets quickly, so your concrete and mortar fixes are done faster than traditional mixes.
EFFORTLESS APPLICATION 💧 - Clean up with just water—no harsh chemicals needed, saving you time and hassle.
FLEXIBLE DURABILITY 🛠️ - Remains flexible after curing to withstand cracks and shifts, ensuring long-lasting repairs.
GENEROUS 10 1 OZ CARTRIDGE 📏 - Perfectly sized for larger or multiple projects—patch sidewalks, steps, and more without constant refills.
VERSATILE SURFACE COMPATIBILITY 🏡 - Ideal for sidewalks, steps, pipes, windows, doors, and even countertops—your all-in-one repair solution.

Red Devil 0646 Concrete & Mortar Repair is a 10.1 oz cartridge of flexible, fast-curing rubber-based repair compound designed for durable, waterproof patching on sidewalks, steps, and various surfaces. Easy water cleanup and a quick set time make it a professional-grade solution for efficient home and commercial maintenance.

Specifications

ASIN	B01M1VBB7U
Brand	Red Devil
Brand Name	Red Devil
Colour	Gray
Country of Publication	USA
Customer Reviews	4.6 out of 5 stars 173 Reviews
Item Form	Strip
Item Weight	1.88 Pounds
Liquid Volume	10.1 Fluid Ounces
Manufacturer	Red Devil
Manufacturer Part Number	0646
Material Type	Acrylic
Model	0646
Number of Items	2
Size of liquid in ounces	10.1 Fluid Ounces
Surface Recommendation	Sidewalk, Step, Pipe, Window, Door, Sink, Tub, Gutter, Counter Top, Tile
UPC	075339006467
Water Resistance Level	Waterproof

Reviews

W**W

Good item.

Appears to be a good product and it should work well.

26.06.2026

N**I

Does the Job, and Does it Well

The color isn't perfect, but I didn't expect it to be. This stuff dispenses well and sets up fairly quickly. Dries hard and seems to be holding up well. Beats the heck out of mixing typical mortar and spreading/pushing it into place.

5.06.2025

P**K

I missed realizing this is caulk. It doesn’t harden up.

I thought this was mortar in a tube. It’s husky caulk. I carelessly applied this product between bricks to replace missing mortar. I added sand to the top. It looks fine. But don’t imagine this stuff has the structural integrity of mortar. However, It does keep water, dirt and weeds out of the voids in my brick staircase.

26.08.2024

A**S

Great product

I had purchased a liquid sort of product designed to patch concrete before, but this product is superior to the liquid gunk. This works well and seals flawlessly. I plan to buy again. I have a large property and there is always something to repair. Get a small putty knife to smooth it out after applying if you need too and it is perfect.

4.11.2023

D**A

Great product

Works great

11.04.2025

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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€ 101.38

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered 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 Cyprus.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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

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