If the walls have numerous cracks or minor leaks, in most cases, a waterproof concrete is used to change the concrete itself. It is based on crystalline technology that allows crystals to form when the concrete gets wet. The concrete literally repairs itself when the walls have hairline or spider cracks in them. The best product in our opinion is manufactured by KrytonGroup and you can find it in any state. If you would like to know more, we have several videos on the website showing how it is used.
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