Nokorode cold weather paste flux is a lead free, soft soldering paste flux especially formulated to stay soft and sticky in cold weather applications. Cold weather paste flux will clean and flux the joint area at the same time, saving time and money. Easy to apply flux paste. The paste flux flow smoothly into even the smallest cavity. Easy to use on all solderable metals such as copper, tin, zinc, and sheet lead. Lead and acid free soldering flux. Safe to use on potable water systems. Nokorode cold weather flux paste; when heated, the flux will reduce the surface tension in the joint and allow the solder to flow esily and uniformly. Not to be used on stainless steel, aluminum, or magnesium. Not recommended for electronic use. FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets.