At Griffin, epoxy is a secondary process applied to some radiators to increase durability. All Griffin Radiators are vacuum brazed with a magnesium based cladding. The purpose of the epoxy is to relieve the shear stress on the tube-to-header braze joint to ensure a long leak free life for radiators used in extreme conditions. The common misconception is that epoxy is used to “glue” radiators together. Some manufacturer's may do this, but Griffin does not. And remember, we make so many different types, not all use epoxy.