A complete system and method can be used for the repair and sealing of a sewer manhole. The process of the present invention includes surface preparation with steps to purge out embedded contaminants, application of a primer to the prepared and purged surface, application of a closed cell foam layer over the primer layer, and application of polyurea layer disposed on the foam layer. By first making sure the concrete is purged of contaminants, the system, when applied, cannot be damaged by the outgassing of contaminants from the coated concrete as may be possible with conventional systems. Moreover, the system of the present invention uses a 100% polyurea coating that provides appropriate flexibility, strength, and chemical resistance.