Once the leak has been located, pull a vacuum, recovering any remaining refrigerant. Mechanically clean the area with a knife or stainless steel brush. Do not use sand cloth or other products that will potentially leave a residue. If sand cloth is used, the epoxy will not stick to the pipe but to the abrasive residue left behind. Heat adjacent to the leak (Do not put the flame directly on HEAT-SEAL STIK as it will melt). Test the HEAT-SEAL STIK by touching it to the metal as the flame is heating the surface. Keep the flame adjacent to the leak and once the HEAT-SEAL STIK begins to melt, rub thoroughly over the leak until covered. Allow the epoxy to cool to room temperature or shock with a wet rag to cool. Test the system with sure chek, VISU-GLOW, or ALERT leak detectors to verify the leak has been repaired. Recharge the system. Remove cured epoxy from the stik with a knife before next use. Cured epoxy cannot be reused.