Concrete cracks are not only an eyesore, but they can also compromise your home or building’s safety. These cracks are usually formed due to improper concrete mixing. The concrete surface can shrink as a result of evaporation of excess water.
But don’t fret – concrete crack fillers are widely available in the market today. They can extend the life of your wall or surface and they are typically easy to apply and dry. Since their appearance mimics concrete, it’s usually easy to paint over them.
While I recommend reading the whole article, if you are in a hurry and looking for a quick recommendation, you should check out the top pick – Applied Technologies Concrete Foundation Crack Repair Kit.
The Applied Technologies Concrete Foundation Crack Repair Kit has nearly everything you need to get started on filling those cracks – including safety tools and applicators.
The formulated crack fillers come in bottles that can be easy to apply. Just use the hydrophobic polyurethane foam for water leaks and the Poxy Paste for improving the bond.
What’s great about this kit is that the instruction is more than just a pamphlet – you also get a DVD to learn the step-by-step process of filling up a crack with the tools and resources provided. You also get a cleaning brush, work gloves, and goggles in addition to the crack filler formulas.
The product is meant to be used for up to 10 feet of cracks, so you can use them in more than one room or spot. The caulk gun and injection ports can also help you fill in smaller gaps – these tools aren’t included in typical repair kits on the market. Not to mention, the formulas are ozone-free, so they probably won’t smell as bad as other commercial ones.
Things I Like About This Product: It comes with everything a beginner needs to fill in cracks – no need to buy applicators separately if this is your first time using a crack filler.
Things to Keep in Mind Before Buying This Product: The basic caulking gun could be designed better but will suffice for most projects.
Designed like a long gray string of spaghetti, the CRACK STIX 1/2 D 125ft. Concrete Joint & Crack Fill is meant to be melted with a propane torch at a flashpoint of 420 degrees Fahrenheit and can dry within 20 minutes or so. About 10 pounds of the material is included in the package.
What’s worth noting is that this product can be applied mess-free compared to the liquified formulas on this list. That’s because you don’t have to take off the plastic wrapping since it melts off with the material when you heat it up.
Since the filler is a little on the heavy side, due to being solidified at first, it might work best for horizontal surfaces such as flooring, basketball courts, sidewalks, and the like. Since it is flexible, you can adjust it to any shape of the concrete crack.
Things I Like About This Product: The no-mess application is more convenient, since you only need to heat it, which avoids product spillage and waste compared to a liquid crack filler. You can also bend and flex the spaghetti-like solid filler depending on the crack’s shape.
Things to Keep in Mind Before Buying This Product: You will need a torch to heat it.
For those who just prefer traditional crack fillers, the Red Devil 0644 1 Quart Pre-Mixed Concrete Patch is a liquid cement-like filler that can work on most cracks. Due to the concrete color, you can easily paint over it when it is finished drying. You can also sand it, so you can attain a smooth finish before painting or decorating.
Cleaning up excess debris is relatively easy since the formula is water-based. Just keep in mind that you’ll need about 24 hours of curing time for it to dry completely.
All you need to apply this concrete patch formula is a putty knife.
Things I Like About This Product: Because you don’t have to mix two formulas, you not only save space in your garage, but you also lessen the prep time for your concrete filler.
Things to Keep in Mind Before Buying This Product: It does take a little longer to dry compared to most crack fillers.
Ideal for concrete cracks as thick as 1 inch, the FDC 3 Part EPOXY Mortar Patching System has a paste-like texture that can work not just on concrete and asphalt surfaces, but also on certain wood and metal. You only need to mix the filling agents included in the set (resin, hardener, and aggregate) for it to be ready to go.
The mixture makes about 3 gallons of concrete crack filler and dries fast, in about 2 hours of curing, so it could work well for a driveway.
Because it dries to a medium grey, it will be easy to paint over with any color you like. You can even apply it to damp concrete just fine, although I believe it’s still better to dry the cracked surface first for best results.
Things I Like About This Product: The mixture dries fast so you can use it for driveways or any medium-traffic area.
Things to Keep in Mind Before Buying This Product: The filler mix can only be cleaned with muriatic acid, which can be a difficult chemical to deal with in terms of safety.
The Damtite 04012 Gray Bonds-On Vinyl Concrete Patch is a 12-pound bucket of concrete filler that only needs to be mixed with water. This can save time and effort instead of having to mix liquid bonding agents and the like. It can be spread for up to 1/16 inch thickness so it can be ideal for basic repairs. As with previous picks, you can also sand and paint over it, but make sure it is completely dry before doing so.
It can accommodate cracks as wide as 1/2 inch and may also work on patio tiles and stone. For driveways, it can take about 3 days to cure but for regular foot traffic, it can work overnight. For every 3 pounds of the concrete patch, you may be able to cover up to 2.5 square feet of area with 1/8 inch of thickness.
Things I Like About This Product: It is one of those “just add water” types of products so there’s less worry about mixing mistakes with aggregates and resins, especially if you’re just looking for a casual DIY home repair.
Things to Keep in Mind Before Buying This Product: The curing process could be lengthy since it takes about 3 days if you want to use it for a driveway.
Made with a squeeze bottle, the Bluestar Flexible Concrete Crack Filler (Light Gray) is yet another mess-free product that uses its narrow tip to fill in cracks on your concrete surface. It can fill up cracks as wide as 1 inch and you can use it whether it’s warm or cold outside.
You don’t need a lot of complicated tools to apply it. However, it does work better on horizontal surfaces, since it is a little bit runny in texture.
With it’s light gray finish, you can easily use lighter paint on it too.
If you have hairline cracks in your concrete structure, this might be more suitable for you due to its small nozzle, which can be applied easily on such crack types.
Things I Like About This Product: The squeeze bottle makes it easy to apply without making mess into concrete cracks. You also don’t have to mix agents and therefore save prep time.
Things to Keep in Mind Before Buying This Product: Because it is runny, it is more suitable for horizontal concrete structures, such as pavement and flooring.
Not all concrete cracks are big – the Bluestar Flexible Concrete Hairline Crack Filler (Light Gray) could be a preventive measure for those with minimal cracks to keep them from getting worse. Like the previous pick, it also comes in a light gray finish that might be easier to paint over, even with lighter colors.
It can also work in both hot and cold weather and can be applied using a thin-ended squeeze nozzle to fill in the hairline cracks in question. Due to the small nozzle, you might even find it useful for garden statues and small patio decor that might need a fix.
Things I Like About This Product: The small nozzle tip allows you to fill in the hairline or small cracks as a preventive measure. The dried color is also light enough for bright paint to show.
Things to Keep in Mind Before Buying This Product: The product applies in thin layers so you might need a few more coats if the crack is a little deeper.
The Methodology: What I Considered When Picking the Concrete Crack Fillers Featured Above
Here are some criteria that I kept in mind when choosing the products featured above. They should also be helpful in your decision making process.
Crack fillers can either be premixed or you must follow provided instructions carefully to mix the different agents included. Usually, the sets come with two to three bottles.
If you prefer less hassle, you might want to try premixed crack fillers instead, which are mostly water-based and so are also easier to clean.
Aside from those, I also mentioned above the CRACK STIX Concrete Joint & Crack Fill, which is a different type due to its solid form. This one might appeal to you if you happen to have a torch in your tool arsenal to activate and melt the material onto the concrete crack(s).
Typically, crack fillers for concrete have a liquid texture so you can use a putty knife to patch these spaces. However, there are also crack fillers that come in a tube so you can use it for smaller and even hairline cracks.
Additionally, there are also types that require heating up with a torch and types that require the use of a caulking gun. Sometimes the gun is provided with the set as is the case with the Applied Technologies Concrete Foundation Crack Repair Kit.
Typically, water-based crack fillers can take more time to dry compared to formulas that need to be mixed first. Those usually only take a couple of hours and so areideal for driveways and busy spots.
Do you intend to use it for floor and pavement cracks or walls?
Based on my reviews above, I’d conclude that when a crack filler feels runny, it’s more suitable for floor cracks to avoid runoff.
You should also consider the size of the crack that you want to fix before choosing your filler.
Weather and Water Resistance
An ideal concrete crack filler, even when it completely dries and cures, needs to be resistant to bad weather, especially since you will most likely use it for outdoor pavement and the like. Fortunately, most of our picks here can withstand the elements with proper application and enough curing time.
If you’re looking for mess-free concrete crack filling, you might like the Applied Technologies Concrete Foundation Crack Repair Kit since it comes with a caulking gun. If you already have a torch in your garage, however, you might also find the CRACK STIX 1/2 D 125ft. Concrete Joint & Crack Fill easy to apply.
For those who prefer water-based crack fillers, the Red Devil 0644 1 Quart Pre-Mixed Concrete Patch and the Damtite 04012 Gray Bonds-On Vinyl Concrete Patch are a good choice. On the other hand, a filler that might be ideal for driveways is the FDC 3 Part EPOXY Mortar Patching System which has a fast drying time.
Finally, for hairline cracks, I recommend the Bluestar Concrete Hairline Crack Filler.