Black polyurethane foam adheres rocks to liners and creates stunning waterfalls like a pro for a fraction of the cost. Dries tack-free in less than 10 minutes and typically cures within one hour. Fire-rated OK for electrical. 12 oz Handi-Foam can is ideal for small projects and applied with included, one-piece straw applicator. For large or multiple jobs, use Polymer Handi-Gun. This unique patented trigger and barrel dispenser streamlines pond projects with convenience and ease. Pro Handi-Gun Kit offers professional reliability and the durability of steel. Teflon coated basket and parts will not corrode or degrade. Use multipurpose Polyurethane Cleaner to dissolve excess uncured foam and adhesive for easy cleanup. (Not for use with the plastic Handi-Gun.) Foam color may lighten as it dries. Both kits (Polymer & Professional) include the appropriate gun and 29 oz foam. Please note: These items are shipped by standard ground service only. We apologize for any inconvenience.