Cinder block wall repair for small fissures or cracks is not a difficult task. As with any home improvement or repair preparation is essential. First purchase patching cement from a local home improvement or hardware store. The amount of yield will be listed on the package; so be sure to purchase enough for the repair. Clean the area of the block wall of any dirt and debris using a wire brush
. then hose down to remove dust. Using a cold chisel and maul; widen the fissure to roughly one inch. One needs to make the widened fissure tapered, so the it is wider at the surface and narrows to roughly one quarter inch at the end; (One should use eye protection during this part of the procedure). Mix patching cement according to manufacturer instructions. Using a three inch putty knife, spread the cement into the fissure filling the gap. Allow to dry; it may be sanded or textured depending on one's desires.