GMNA 9986474 PDF

This specification covers the qualification and performance requirements of Waterborne (WB) 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 9986475 Waterborne Basecoat Component for Semi-Compressed Integrated Topcoat System and 9984515 Two Component Clearcoat for Waterborne or Solventborne Basecoats.

Specified herein are material requirements per the Material Engineering (ME) Vehicle Systems Paint Materials Group. These specifications are used to verify the materials have been processed to produce a finished product of quality consistent with that proven in initial qualification testing.

Symbols. Not applicable.

Applicability. These waterborne primers are typically applied to electro-coated surfaces or appropriately primed rigid plastics. Following the primer application, an ambient flash is employed to dehydrate the primer prior to waterborne basecoat (9986475) application. The waterborne basecoat is then applied and also dehydrated in a heated flash. Following the 9984515 clearcoat application, 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 BCP, 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 and approved. 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.