Crack Sealant

The gray water tank on my class A RV was smelling terrible. It was getting inside the living area and making everything smell terrible. I couldn’t find a leak anywhere. When I looked at all the connections and the tank, the only thing I could find was how this pipe went into the top of the tank, there was no rubber connection with clamps. That seemed very suspicious to me. It just appeared to be stuck into the top of the tank, and sealed in there with what appeared to be plumbers putty. I called the manufacturer and asked if this was how it was supposed to be. I would purchase a rubber connection if it was available. They said they are still doing it this way and if they have a problem to use a Sikaflex gray compound. I purchased a tube, and although the pipe comes out of the top of the tank I used the self leveling compound. I started applying it above the suspect area and let it flow down over the existing stuff and let it flow onto the top of the tank. It actually made a very nice looking cone shaped seal. By that evening, I could tell the smell was getting better. It’s been about two weeks and you can’t detect it in the RV anymore. I have aired out the basement in the RV and that seems fine now too. I would highly recommend this flexible sealant. It’s amazing how flexible it is and how well it sealed this connection. We suffered with the smell for years until I had checked every fitting and the tank. The only thing left was this connection, but it appeared fine. The crack filling abilities of this self leveling system must have flowed into the source of the problem! Best ten bucks I’ve spent in a long time!

This stuff is amazing and absolutely delivers on it's promises! I originally completed this project using the horrible Dap version of concrete filler/seal which was horrible to work with and NEVER set (even after 2 dry 70 degree days) and essentially washed away on 1st rain. I completed the project again with this Sikaflex and it worked perfectly. It completely self levels and fills in the void. The best advice I have is DON'T touch it. Just lay your bead and let it work it's magic. It completely levels and leaves a smooth finish. Then come back and re-fill any voids that may appear. I had used sand then backer rod so I only had one corner spot that needed a little extra fill. I also sprinkle a little of the sand on the still wet seal to add to the concrete look though this Sikaflex already has a nice texture. This stuff has a great look on it's own and I'm so impressed with how well it works and looks. It's now cured and firm, yet pliable to the touch. I should have used this stuff in the first place.

I used the product for two different solutions: I filled a gap under my garage door seal, and to fill cracks on a porch slab. For the garage door seal I applied a few thin layers, where the self-leveling property works very well. I built up a good, flat surface. For the crack-filling, the product flowed into the cracks very well and seems to have sealed very well. Because I applied the product in relatively cool conditions, I contacted the manufacturer about that issue, and was given specific advice. The ambient temperature met the stated specifications for the product, and it worked. The only negative feature is the color, which does not match the color of concrete at all - it stays very bright.

I called and spoke with a Sika rep to make sure I was using the correct product. I have used their products in the past and have been very happy with the results years later. This crack fix is no exception to that! This product is self leveling, so you would only use it on a horizontal surface. I prepped the crack by using my Ryobi multi tool with diamond blades that I purchased on amazon to widen the crack. I then brushed everything out with a wire brush and then blew out the area with a blower, as the multi tool caused a lot of dust. This was still a lot easier, cleaner and safer than chiseling the crack wider. Filled the crack with this Sika product and it turned out really nice and clean looking. I used another Sika product to fill my garage floor expansion joints after the garage was built, the garage is in it's 7th year and the Sika product is still going strong! Highly recommended!

Good product although a little expensive for the application

solo que no hay manera de ver la caducidad del producto, lo mandan muy limitado

Works well, flows nicely into gaps. Tip on use, consider the color of the concrete wet and dry - on my project, it was to fill a gap between the sidewalk and steps. The material is light grey which matches well when the sidewalk is dry but my sidewalk turns dark grey when wet which contrasts with the light grey material. Also, the material flows well so make sure to completely back the gap with backer rod or foam, otherwise, the material will leak away.

Llegó prácticamente seco

Used on garage floor crack that extended from one side to the other. I used my mini grinder with a cheap diamond blade to chase the crack, then vacuumed the dust. The SikafIex sealant went on very easily after warming the tube on an old heating blanket. It's kind of gooey, but levels itself into the crack after a few minutes. I had watched a YouTube video on using this product which suggests to sprinkle some Quickrete on the repair to blend it in with the older concrete on the floor, and I found this works great, only don't sprinkle it with water like the video suggests. Just leave it alone for awhile and then whisk it off and vacuum after the Sikaflex has set up a bit. Was hesitant to start this job, but it really was pretty simple to do with the Sikaflex Concrete Crack Sealant. Make sure you wear gloves and old clothing. UPDATE - 1-1/2 year later: The Sikaflex has performed perfectly, however I would skip the Quickrete if I were to do it again. It turned kind of brownish and did not look like concrete. Next time I will just use the straight Sikaflex, since it does look like light colored concrete.