Experts and BHG readers answer.
How do I repair cracks in basement wall?
I'm assuming the basement is below-grade. If so, the only way to properly repair is from the outside of the wall. This will require the exterior to be excavated to gain access to the crack. Hire a licensed company to perform this work since you risk a possible deadly cave-in. Since you probably didn't sign up for such drastic measures, it can't hurt to try your repair kit and see if it works.