Hi Nanciann, What you need is an elastomeric coating. Different companies have different products, and I believe SW has two or three, which you can discuss with the paint co for your needs. Be sure to read the link under PDS
. You'll learn such things as two coats are required to block wind driven rain, to water"proof" it, and that it's not designed to block hydrostatic pressure, which means it's not spec'd below grade. Below grade would be a job for foundation guys.