THE ABILITY OF A COATING TO RESIST chemical deterioration or staining is an essential element in its evaluation. What follows is a review of established test procedures with various levels of complexity and equipment sophistication that provide a standardized tool for evaluating potential flaws such as discoloration, softening, swelling, adhesion loss, gloss reduction, etc. These tests provide a common ground for crucial communication of performance properties between the manufacturer and end user of a coating. Since these tests are to be representative of actual exposure conditions, it is vital that the tests approximate, as closely as possible, genuine conditions in the field [1].