scope:

This specification covers the requirements for a conductive, low bake primer for use over plastics. The primer shall provide a smooth, adhesion promoting, conductive surface for electrostatic 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. It must also provide UV protection to any underlying coatings and the substrate.

Material Description.

This primer is part of the 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 bake temperatures less than or equal to 93°C (200°F)

Specifications Qualified to this Material Specification.

This 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 Materials Specifications file (MATSPC), which lists approved substrate, cleaning, priming, and topcoat combinations. APOPS test requirements are defined in GM4497M.

Typical Application.

Primers covered under this specification are typically applied to plastic substrates that could lose functional or dimensional integrity at higher bake temperatures. They are used under an approved topcoat system.