Bluemax is awesome. It can be used on the walls as I have here, or you can use it on outside foundation as well. It acts like rubber and actually can expand and contract/stretch. My basement has 2 sump pumps and a backup water powered pump as well. The basement is always pretty dry now, but I am the type who leaves nothing to chance... I had a radon fan installed, and plexiglass lids put on the sump pumps. The gray one you see is the water powered pump, below that is a Zoler Die case metal pump.... I plan to use 2" XPS on the walls and then use Delta FL on the floors.... For any leaks, remove old cement and use Hydraulic Cement before coating with blue...