A method for determining the thickness of a dryable or curable film-forming coating by incorporating a fluorescent component into the coating. The fluorescent component is either a resin solid of the coating, a fluorescent dye or a fluorescent dye attached to a resin solid of the coating. The coating...http://www.google.es/patents/US6410926?utm_source=gb-gplus-sharePatente US6410926 - Coating with optical taggent
