methods and systems for cleaning , coating and sealing leaks in existing pipes , in a single operation . a piping system can be cleaned in one pass by dry particulates forced and pulled by air throughout the piping system by a generator and a vacuum . pipes can be protected from water corrosion , erosion and electrolysis , extending the life of pipes such as copper , steel , lead , brass , cast iron piping and composite materials . coatings can be applied to pipes having diameters up to approximately 6 ″. leak sealants of at least approximately 4 mils thick can cover insides of pipes , and can include novel mixtures of fillers and epoxy materials , and viscosity levels . a positive pressure can be maintained within the pipes during applications . piping systems can be returned to service within approximately 96 hours .