SIKA Sikaflex Self Leveling Sealant, Sandstone, 29 fl oz fL, Polyurethane, Sealing Horizontal Expansion Joints in Concrete, Accelerated Curing, Self-Leveling, Durable

I really like this stuff. It flows and self-levels very well but that quality means some advance planning makes things go much smoother.My advice is to keep the box it came in and when you go to apply it cut off the box flaps from the side you opened and put a grocery store plastic bag in the bottom of the empty box. Also, have paper towels handy. The reason for this? Unlike caulk, when you stop pumping this stuff out and it quits flowing it still drips for a long time, even from an "empty" tube. When the tube is empty immediately point the spout up, remove the tube from the caulk gun and throw it in the box you kept.Also, when you stop pumping this stuff out it takes a while for it to stop flowing like caulk does, but even then, if you point the nozzle down it will slowly flow out of the tube. It is handy to have one of those cardboard flaps you cut off to immediately slide under the nozzle as you lift it up from the job. Get the nozzle pointed up and have a paper towel ready.Also, if you use a backer rod, make sure it is a tight fit. I had one spot where the backer rod barely touched each side and this stuff apparently flowed through a bit. I had a dip in edges in that spot as it cured. If the backer rod is not reasonably tight I suggest putting a little coarse "play sand" on the sides of the backer rod (where the backer rod curves down and meets the concrete on each side).You can ignore all that and still get a great result, but you might then spend a good while cleaning up.

If you’re looking for a sealant that combines ease of use with long-lasting performance, look no further than Sika Sikaflex Self-Leveling Sealant. This product has transformed my concrete surfaces, providing a clean, durable, and professional finish with minimal effort.Why I Love It:• Self-Leveling Magic: The true beauty of this sealant lies in its self-leveling properties. Once applied, it flows smoothly into joints, creating a flat, even surface without the need for tooling. This feature is particularly beneficial for those new to sealant applications, as it reduces the chances of uneven lines or missed spots.• Durability That Lasts: After curing, the sealant remains permanently elastic, effectively bridging gaps up to 1.5 inches wide. It’s designed to withstand the rigors of daily traffic, weather fluctuations, and the wear and tear typical of high-traffic areas like driveways and garage floors.• Quick and Easy Application: The product is a one-component polyurethane sealant, meaning no mixing is required. It’s available in both 10.1 fl. oz. and 29 fl. oz. cartridges, catering to various project sizes. The application process is straightforward—just clean the joint, apply the sealant, and let it level itself.• Paintable and Weather-Resistant: Once cured, the sealant is paintable with water-based, oil-based, or rubber-based paints, allowing it to blend seamlessly with your existing surfaces. It’s also waterproof and resistant to aging and weathering, ensuring long-term performance.Tips for Best Results:• Surface Preparation: Ensure that the joint surfaces are clean, dry, and free from oil, grease, or any other contaminants. This will promote optimal adhesion and longevity of the sealant.• Use Backer Rods: For deep joints, consider using a backer rod to control the depth of the sealant and prevent excessive use.• Curing Time: Allow the sealant to cure for 3 to 5 days for full strength. During this period, avoid any traffic or disturbance to ensure the best results.

This stuff is the best. I decided to fix a bunch of cracks on my 20+ year old driveway and to clean and fill expansion joints. This product levels very well and seals up completely within 24 hours. It is significantly better than all of the other crack fillers that I have tried. Highly recommended!

I wrote a bad review for the above product in which I observed color separation from this product. I want to correct this because I have since learned it was not the caulk that caused the discoloration but the clear coat sealer for my faux brick concrete driveway. The caulk as advertised is holding up fine and I will buy this product again. I am sorry if my comments caused any problems for potential buyers, Tim

Tenacious product, with proper surface prep, but steep learning curve on applying neatly. Flow does not stop, but is not consistent. Like molasses. “Strings” blow in the breeze when you lift nozzle, to touch anywhere but the joint. Glove up and put your finger on the nozzle to stop the flow. Don’t wipe any spills, a pressure washer can blow off the “strings” (if usable in your situation) but not smears. In a pinch I sprayed DEET on a fresh, isolated blob on brick, trying to prevent adhesion. This did allow the pressure washer to remove it easily, after hardening. Use masking/painter’s tape to protect critical areas.

Don't forget to punch the inner seal down the tube or the sealant won't come out. This sealant is great.all my tubes were in great shape and worked great. I would recommend this product for any one fixing cracks in there driveway

Enough for one joint

Works great, self leveling, fills the cracks. Great for amateurs!