Prior to performing this type of repair, it is highly recommended to practice on a small mock-up or on a crack in a non-visible location.įor more help, call us at ChemCo Systems (80, 65).Repair basement wall cracks in need of structural strength. If the crack can be masked on both sides, then it is easier to prevent the water-wetted area to be repaired from extending far past the crack edges. If masking tape is used, you will have to puncture it at the locations of each surface port in order to connect with the crack.įor large areas, or surfaces with other defects including bug holes, it may be more convenient to use a wet sacking mix which contains Portland cement, fine aggregates and other admixtures similar to the constituents of the original concrete finish. This minimizes the daylight shadow created by the indented seal. This prevents the StripSEAL from penetrating deeper into the crack walls and allows the pumped in injection resin to fill to the level of the surface. You can get the tape from professional paint supply stores. If the crack is relatively wide (you be the judge), you can pre-place a strip of 1/4” masking tape completely over the whole crack before sealing with StripSEAL. The fine aggregate should match the color of the surface and fill in the shadow of the crack as the fine grains are held in place by the still tacky epoxy. Optionally, the dry aggregate can be scrubbed over the surface using a soft sponge rubber float. Then take a small burlap sack filled with a blend of the small (fine) aggregate and dust the area of the crack until the still tacky glue line is covered. Strip the epoxy surface seal no more than 30 minutes after the injection resin has gelled (long before cure, but while the epoxy is still tacky). size 40-50 mesh) used in the original concrete mix or a similarly colored facsimile. First, you will need to locate some of the smaller (fine) aggregate (suggested max. In concrete crack repair projects where appearance and aesthetics are especially critical, you can try a modified dry sack technique. This homemade solution can be sponged and scrubbed into the surface, allowed to soak and then rinse off. Although there are proprietary products formulated for this purpose, some specialists swear by a combination of warm dilute acetic acid (vinegar) and 1 % dish soap. Be careful to avoid altering the surface texture or exposing the aggregate below the surface paste.Īn alternative stain removal procedure is to use a mild acid micro etch applied on the concrete surface. If the localized area around the crack is stained from water leaks, dirt deposits, white crystalline deposits (also called efflorescence), high pressure water blasting (5000 psi) or light sandblasting might be the first thing to try. In some cases, cracks can be made almost invisible.Īrchitectural precast and GFRC panel manufacturers as well as many concrete repair contractors have developed several techniques to hide cracks if a new surface coating is not the answer. Can you make epoxy injection repaired cracks in concrete disappear? This is a difficult challenge, but you can take steps to reduce their visibility.
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