The drylock I have used is for inside the walls. Thats the only one I saw at HD
I saw a bunch of Henry stuff for roofing. Not sure if that is good under ground. So many of these product have become water based, I’m leery of using them for something like this. Will run down to Ace in the morning. If I don't find anything made for it, I will get neoprene caulk and smear it on...