Concrete walls, pebbles and blind areas often have small cracks. Precipitation gets into them, freezes in winter, expands and breaks the concrete. To avoid this, it is necessary to seal even narrow cracks. This can be done quickly and easily using sealant. What you will need: polyurethane sealant; They are then filled with sealant from a gun and removed with a finger or putty knife. Then you need to give the composition time to dry, and if necessary, the surface can be sanded. Potholes on concrete surfaces can be repaired in a similar manner. Polyurethane sealants once cured are similar to rubber. They can extend over 300%. This way, if the crack begins to expand, the repair compound will move with it, but will not allow moisture to penetrate inside.
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