Clay, Please find the attached product information for your information, recommended to us by our subcontractor, Magnum Manholes. They would install a flow through plug, pressure clean the surfaces, apply Quadex Hyperform, to bring the surface to the proper contour, and then apply the Raven Expoxy coating. It normally takes about 3 hours. (See attached file: Raven405TDS.pdf)(See attached file: hyperform.pdf) Please advise if this may meet with your approval so we can schedule the work to be done as soon as possible. Thank You, Phillip M. Hutchings V. P. of Operations Tri Dal Celina, Ltd. 540 Commerce St. Southlake, TX 76092 (817) 481-2886 Ext 237 Fax (817) 481-8195