This specification covers the qualification and performance requirements of low solids, high bake, solventborne basecoat (BC) technologies that may be applied to either flexible or rigid substrates. These BCs can be used under a one (1) component or two (2) component clearcoat (CC).

Material Description.

Each combination of specific BC and CC must be tested and approved as a BC/CC topcoat system. The individual components are not interchangeable. In addition, the topcoat system is part of the total coating system and must meet the requirements as outlined in GMW3005, those set forth in this specification, and on the engineering drawings. Validation testing for plant specific layering, ancillary materials, and processing must be conducted prior to release. The nominal bake for this topcoat system is 25 minutes at 130 °C (265 °F) substrate temperature. Volume non-volatile solids range of this technology is typically 10% to 25%.

Symbols.

Not applicable.

Applicability.

These topcoats are designed to be applied over a baked primer.

Remarks.

None.