This specification covers the qualification and performance requirements for exterior, onecomponent (1K) solventborne basecoat (BC) and two-component (2K) solventborne clearcoat (CC) topcoats that perform over bake latitude of 82 to 135°C (180 to 275°F).

Material Description. Basecoat components of these systems are typically 1K (solvent) acrylic melamine. Clearcoat components of these systems are flexible, 2K (solvent) urethane or urethane blends. Each combination of specific basecoat and clearcoat must be tested and approved as a basecoat/clearcoat system. The individual components are not interchangeable and are approved for use only with combinations of basecoat/clearcoat of the total paint system which were used in qualification testing.

Symbols. Not applicable.

Typical Applications. These topcoats can be used on heat sensitive plastics, flexible or rigid plastic parts.

Note: All Thermoplastic Polyolefin (TPO) substrates using 9984904 must be primed with a 9984905 or 9984908 adhesion promoter or Flame treated TPO per GMW16133.

Remarks. Not applicable.