Abstract Industrial experience during the past fifteen years has shown that chlorinated rubber is an outstanding film-forming material from which corrosion-resistant coatings may be formulated. Correct formulation has a marked beneficial effect on resistance of chlorinated rubber systems to corrosive solutions or atmospheres. For maximum chemical resistance the types of modifiers for chlorinated rubber are restricted to chemically inert resins and plasticizers which must be formulated properly to give optimum film properties and satisfactory weathering resistance. If proper precautions in selecting the modifying components are not considered, corrosion resistance of chlorinated rubber coatings may be seriously impaired. For example, alkali resistance rapidly diminishes when the vehicle is modified with saponifiable resins or plasticizers. Similar deficiencies develop if components are incorporated which are not themselves unaffected by acids or salts. Pigmented coatings in which the film consists of 50–60...