Welcome, Keith. The only way it will last is to seal the outside. Anything else is cosmetic. Have good drainage, get rid of standing water, and make sure downspouts are carried out from house. I enjoy this:
http://www.buildingscience.com/docu...rol-for-new-residential-buildings?full_view=1
Be safe, GBR
http://www.buildingscience.com/docu...rol-for-new-residential-buildings?full_view=1
Be safe, GBR