It is not for use on vertical surfaces, meaning you cannot use it for cracks in walls or stair risers, or for cracks on horizontal surfaces that are sloped. Note that this is only for sealing cracks on horizontal surfaces, such as garage floors, driveways or walkways, or patios. It dries to a light gray that matches the color of concrete, but you can paint or stain it once it's cured if you prefer another color. And it's waterproof and resistant to shrinking or cracking. ![]() Once you've filled the crack, the sealant will self-level to create an even surface, so you won't need to scrape or sand away a rounded or humped-up edge. You'll need a caulk gun to squeeze the thick substance into the crack the 10.1-ounce tube fits most caulk guns. Once cured, it has excellent adhesion, but remains slightly flexible, making it ideal for use in cracks that are exposed to weather extremes. You can use it on freshly poured concrete that has cured for at least 24 hours, and you can even use it on damp concrete as long as the rain or other source of water has been stopped for at least an hour. This polyurethane sealant dries to the touch in just one or two hours but can take three to five days to fully cure. If you need to repair a concrete crack that's a minimum of 1/4-inch wide up to a maximum of 1 1/2-inches wide and 1/2-inch deep, then our top recommendation is Sikaflex Pro Self-Leveling Sealant. Not for use on vertical surfaces or sloped surfaces To help with your next repair project, we evaluated concrete crack fillers based on type, effectiveness, ease of application, cure time, weather and moisture resistance, and overall value. Use hydraulic cement compounds in foundation walls and other structural components where the concrete could come into frequent contact with water. " Look for self-leveling compounds for horizontal surfaces and grouts for vertical ones. Cheap crack fillers tend to look good at the outset but don't offer many long-term benefits. That's why it's always a good idea to repair and fill any cracks in concrete that are more than hairline fractures.ĭeane Biermeier, carpenter and former contractor as well as a member of The Spruce's Home Improvement Review Board says, "Concrete crack fillers are one of those, 'You get what you pay for' items. ![]() While some minor cracks are merely cosmetically undesirable, extensive cracking or spalling of your concrete walkway, driveway, garage floor, foundation, or concrete walls can lead to water seepage, lifted areas that are tripping hazards, or structural weakness. While concrete is a very durable building material-after all, there are concrete structures built by the ancient Romans that are still standing and even usable-it does tend to develop cracks over time, as well as flake or peel (also known as spalling). Repairing cracked concrete isn't too difficult of a DIY project as long as you have the right concrete crack filler. ![]()
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