Hello. Do you figure out what cracks are? Because I read here https://www.pomwaterproofing.ca/leak-and-crack-in-walls-outside/ which also depends on the method of sealing cracks. For example, I have brick walls at home, so first I removed a cracked solution from the surface with a special scraper. But the main thing is to ensure that the integrity of the brick does not suffer. After he applied a new solution and smooth it with neat movements. Everything is in principle simple, but if you can invite a professional.