"PROTECTS LINER FROM SHARP EDGES AND CORROSIVE MATERIAL! Closed-cell 1/8"" foam padding provides a smooth wall backing, preventing rust, corrosion, or other wall degradation from puncturing or wearing down your liner. SPRAY ADHESIVE Provides quick, easy and permanent application of Wall Foam! Can weight 17 oz. Can contains 24 fl. oz. (material expands) Four cans required for every 125 ft. of Wall Foam."
Price: $67.49 from poolproducts.com