I have a cinder block house and mold has deteriorated about 1/4 inch on the base. How do I seal the space myself. I know I have to remove mold but how do I seal the part of the cinder/cement that has crumbled

How about a bit more info. You said you have a cinder block house. Is this the foundation you speaking of or another part of the house. You can seal it in a few different ways, but I am not sure of what you are trying to accomplish. Tell me why you want to seal it? To protect it from more surface mold, or to try to keep mositure from coming through?

Your turn.