scope:

This specification covers the requirements for a rigid, nonconductive primer for thermoplastics. The primer shall provide a smooth, adhesion promoting surface for application of subsequent coatings. The primer must be sandable, have the ability to fill minor surface imperfections in the substrate, and act as a barrier to prevent popping of topcoats during subsequent bakes.

Material Description. This nonconductive primer is part of a total painted product system and must meet requirements set forth in the specifications for other materials with which it is used. This specification shall be used in conjunction with the Approved Paint on Plastics Systems (APOPS), a section of the Material Specification file (MATSPC) which lists approved substrate, cleaning, priming, and topcoat combinations. APOPS test requirements are defined in GMW14797. This primer is part of a total painted product system and must provide a smooth, adhesion-promoting coating direct to substrate or in-mold coating and to subsequent coatings. Primers approved to this specification must cure and meet all performance requirements at 121°C (250°F) bake.

Symbols. Not applicable.

Typical Applications. Primers covered under this specification are typically applied to rigid plastic substrates. They are used under an approved topcoat system.

Remarks. Not applicable.