Millions of Americans use evaporative cooling rather than air conditioning to cool their homes. There are quite a few cooler manufacturers to choose from. The most common coolers are made of sheet metal materials. Even though the metal has a galvanized coating and then is painted, the water mixed with a high concentration of minerals eats away at the metal. Usually within the first few years rusting begins to deteriorate the metal water pan and side panels. Years ago when the paints contained lead the coolers would last longer. Now it seems that most Evaporative Coolers, or Swamp Coolers as some call them, only last about five to seven years.…