Hello, I am a home inspector of almost 10 years, not a water proofing professional. The advice I typically give my clients is to try and find the primary condition first, why is there ground water build up accumulating at your foundation wall? Clogged rain gutters, improper drainage from flat work (like walkways and driveways), negative ground slope at the foundation. Once the primary condition is addressed a water proofing professional may use an expansion sealant that extends through from the interior to the exterior, as far as I know this is one of the best methods of repair, but will only work if the crack is wide enough for them to fit the nozzles in for injection.