Exterior concrete can develop surface scaling and cracks over time due to exposure to the elements. With proper surface preparation and material selection, homeowners can make durable repairs to damaged areas, extending the concrete’s life.

This step-by-step guide will explain how to treat concrete cracks by making thin repairs to damaged concrete surfaces.


Step 1: Remove Damaged Concrete

Properly preparing the surface is the first step to successful concrete repair. A solid, clean surface enables the repair material to permanently bond to the damaged area.

It’s vital to remove any unsound or flaking concrete before repairing. Chip away damaged areas using a hammer and chisel or a masonry grinding disk and portable drill until you reach solid, structurally sound concrete underneath. Eliminating compromised concrete allows the repair compound to bond correctly.

Wear safety glasses, gloves, and a dust mask to protect from debris when breaking concrete. Outline the repair area with painter’s tape once you remove the unsound concrete.


Step 2: Remove Loose Concrete Material

After chipping away damaged concrete, use a wire brush to remove the remaining loose material and concrete dust inside the outlined repair area. Vigorously scrub with the wire brush to provide a solid, bare concrete surface without weak or crumbling spots. 

Today’s Homeowner Tips

Concrete dust removal is easier if you vacuum while brushing. Wipe away residual dust with a dry cloth when finished.


Step 3: Clean Concrete 

Clean concrete before repairing using QUIKRETE Concrete and Asphalt Cleaner. The cleaner removes any dirt, oil, or grease that could prevent proper bonding. The concentrated detergent works on concrete, asphalt, pavers, brick, masonry, and stone. Use full strength for heavy-duty cleaning or diluted with water for general cleaning.

Apply cleaner to the outlined repair area, scrubbing with a stiff bristle brush. Let it sit for three to five minutes before thoroughly rinsing away the residue with clean water. Inspect the area after rinsing to ensure no cleaning residue remains that could hinder bonding. Let the surface dry for six to eight hours before continuing.


Step 4: Choose Concrete Repair Material

QUIKRETE has different products for distinct repair applications. For thin concrete surface repairs, choose one of the following, depending on what needs repair:

  • QUIKRETE Vinyl Concrete Patcher: This cement-based material is enhanced with a polymer resin that bonds well. It feather edges down from ¼-inch repairs. Mix with water to patch small damaged concrete areas.

Compare product specs to pick the best fit for your concrete’s size and depth. The Vinyl Patcher offers greater strength for heavy-use repairs, while the Patching Compound provides an easy solution for minor surface fixes. Check our breakdown of concrete driveway patch costs to budget for repairs.


Step 5: Apply Solutions To Cracks

Next, plan to mix and apply the solutions to the concrete cracks. Here’s how to use each of the aforementioned products.

QUIKRETE Vinyl Concrete Patcher

Properly mix the Vinyl Concrete Patcher by pouring 10 oz water into a container. Gradually add about 5 lbs of powder while constantly stirring with a mixing paddle on low speed. The right water ratio is key for a successful bond. Too much water weakens strength. 

Thoroughly mix for up to five minutes until smooth. Let it sit undisturbed for a few minutes to let the polymer resin activate, then remix it before use. Only add small amounts of water for a putty-like consistency if needed, and avoid adding extra water once the mix hardens.

Pre-dampen the outlined repair area before filling to prevent bonding issues and cracking. Mist concrete with water and sop up standing water so the surface stays moist, not soaked.

Use a trowel to press the mix into the damp repair zone, filling it completely. For deep patches, build thin layers, allowing 30 minutes between each to cure. Smooth and blend layers for a seamless fill.

Feather edges around the patch for a flush finish. Protect layers from excess moisture while curing. Allow one day before foot traffic and three days before vehicle traffic in patched areas.

QUIKRETE Patching Compound

For cracks and damage under 1/4 inch wide, Concrete Patching Compound offers an easy fix. Stir in the premixed compound first. Force into cracks with a putty knife, smoothing flush.

Spread compound over damaged spots under 1/4 inch, matching concrete texture. Lightly mist patch for 30 minutes while drying to prevent fast evaporation. It should be dry in one to two hours.


So, Is Making Surface Repairs To Concrete Difficult?

Repairing minor concrete damage like scaling, cracks, or spalls seems straightforward. But without proper technique, repairs fail quickly. Taking time to correctly prepare and choose patching compounds improves success. With practice, DIYers can easily do concrete repairs if you allow full cure times, thoroughly prepare the surface, and mix products at the ideal consistency for strong bonds.


FAQs About Concrete Surface Repairs

Can I use a standard concrete mix for surface repairs?

Specialty compounds like QUIKRETE Vinyl Concrete Patcher, which bonds thin layers, work best. The standard mix suits thicker structural repairs better.


What causes surface damage to concrete?

Factors like freeze-thaw cycles, inadequate curing, heavy use, corrosion issues, and chemical exposure can all damage concrete over time. Preventative sealants help protect surfaces.


How long do concrete repair compounds take to cure?

Cure times vary by product, from one to two hours for quick fixes and up to two to four days for structural repairs. Check the manufacturer’s directions for specifics, as proper curing is vital for durable repairs.


Can I apply new concrete over damaged areas rather than using patch mixes?

I don’t recommend applying new concrete over damaged areas. Without special bonding agents, new concrete layers adhere poorly and risk peeling or cracking. In contrast, patch mixes will bond directly to existing concrete.


Editorial Contributors
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Jonathon Jachura

Contributor

Jonathon Jachura is a two-time homeowner with hands-on experience with HVAC, gutters, plumbing, lawn care, pest control, and other aspects of owning a home. He is passionate about home maintenance and finding the best services. His main goal is to educate others with crisp, concise descriptions that any homeowner can use. Jon uses his strong technical background to create engaging, easy-to-read, and informative guides. He does most of his home and lawn projects himself but hires professional companies for the “big things.” He knows what goes into finding the best service providers and contractors. Jon studied mechanical engineering at Purdue University in Indiana and worked in the HVAC industry for 12 years. Between his various home improvement projects, he enjoys the outdoors, a good cup of coffee, and spending time with his family.

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Lori Zaino

Lori Zaino is a freelance writer and editor based in Madrid, Spain. With nearly two decades of editorial experience, she’s written and edited for publications like Forbes, CNN, Insider, NBC, Newsweek, The Points Guy, The Infatuation, and many others. Having just completed her first home renovation, she’s more interested in home improvements than ever, dedicated to bringing you fresh and accurate content to help you update your living spaces.

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