I have been told the polyurethane (from Sika, also sold as radon sealant) you squeezed from the inside into the outside towards the inside using "ports" works really well. I was planning to use it.
But I did a quick fix of putting three bricks under the crack as a well to hold the water (and a tube to take it to the drain). I attached the bricks using a slather of Loctite PL polyurethane and the area around the bricks has been wet a lot longer than without any sealant (ie the bricks just sitting there waiting for project). Now I applied the polyurethane about 12hrs before the rain leak, and polyur sez 1 wk to cure, and they say it bonds better when wet. So in a week, will it be waterproof?
Some folks insist elastomer or silicone are preferrable. So, I'm tempted to put a dab of sealant on a small piece of tubing and some dye on the other side and compare the sealants side by side. But I wanna know the real underlying experimental variables in order to do that right.