System Three EndRot™ Borate Free Repair Kit. Why replace when you can restore? Rot is a fungus, and it can spread quickly, infecting, and then destroying sound wood in its path. Replacement can be expensive or time-consuming and sometimes nearly impossible. Cutting out the rotten areas may not remove all of the "infected" wood which will continue to rot. Contains enough material to complete a typical repair to a window or door severely damaged by rot, weather, and sun. Includes 3 oz. rotfix kit, 16 oz. sculpwood putty kit, 4 oz. sculpwood paste kit, 2 oz., brush, gloves, instructions.