GMNA - 9986328
Waterborne Basecoat Compatible Primer Component of Non-Compressed Integrated Topcoat System
|Publication Date:||1 April 2019|
This specification covers the qualification and performance requirements of waterborne basecoat compatible primer (BCP) that is applied to rigid substrates.
Material Description. These primers are waterborne technologies and are components of rigid topcoat systems that are used in conjunction with 9984515 and 9986329.
Symbols. Not applicable.
Applicability. These waterborne primers are typically applied to electro-coated surfaces or appropriately primed rigid plastics. Following the primer application, heated flash is employed to dehydrate the primer prior to waterborne basecoat application per 9986329. Specific heated flash temperatures are dependent on supplier technology and heated flash design conditions needed to achieve prescribed dehydration levels. The waterborne basecoat is then applied and dehydrated in a heated flash. Following the coating layer of clearcoat application per 9984515, the entire system consisting of primer layer, basecoat layer and clearcoat layer is baked simultaneously in a single bake, as described in 3.2.
Remarks. Each combination of basecoat compatible primer, basecoat (BC) and clearcoat (CC) must be tested and approved as a topcoat system. The individual components are not interchangeable between suppliers unless otherwise tested. In addition, the topcoat system is part of the total coating system and must meet qualifications set forth in this specification and those shown on engineering drawings. Validation testing for plant specific layering, ancillary materials and processing must be conducted before release.