SSPC QP certification is a standard similar to ISO but the QP program is specifically geared to the coatings industry. A program description is available from the SSPC web site:
The SSPC Painting Contractor Certification Programs are based on consensus standards developed by a diverse committee of industry professionals. It is a nationally recognized independent contractor evaluation program, as well as a pre-qualification tool developed by SSPC for facility owners and others who hire industrial painting contractors. Each program reviews the industrial painting contractor's primary ability to provide quality work in accordance with applicable safety, health and environmental compliance standards. The program is divided into the following categories: