ASTM salt spray is the most commonly used salt spray for testing of inorganic and organic coatings, especially where such tests are used for material or product specifications. Government agencies and the automotive industries have developed standard requirements for coating testing. ASTM salt spray testing is a tool for evaluating the uniformity of thickness and degree of porosity of metallic and nonmetallic protective coatings. ASTM salt spray testing can help find new innovative ways of preventing corrosion on a wide variety of products. A number of samples can be tested at once depending upon their size which will determine the magnitude and amount of ASTM salt spray applied.