GMNA-9984076-1988.pdf
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1、I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint SPOlTlNG SURFACER - HIGH SOLIDS, HIGH BAKE FOR ENAMEL 9984076 1 SCOPE. This specification covers the requirements for 30 minutes at 163 C. thermosetting, sandable, high solids, solvent-borne spotting surfacer that is applied by
2、 spraying and is subsequently topcoated with high solids acrylic enamel topcoats. The spotting surfacer is intended for wet-on-wet use over high solids piimer surfacers where metal imperfections require a heavy, easily sanded, Slling material. The spotting surfacer may also serve as a guide coat to
3、warn against excessive sanding when the primer surfacer has been reached. These coated surfaces have additional requirements set forth in the specifications for subsequent coatings. 2 REFERENCED STANDARDS. GM4356M GM9509P ASTM D1186 ASTM D1474A ASTM D3363 3 REQUIREMENTS. See GM4356M for additional r
4、e- quirements not listed in this specification. The requirements listed below shall be met on all critical surfaces of the article or as designated by the applicable product engineering documents. 3.1 Film Thickness (ASTh4 D1186): spotting surfacer only: Range . . . . . . . . . . . . . . . . . . . .
5、 . . . . . . . . . . . . . . . . . . . . . . .25-50 pm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 75 elm Total Primer: Max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . lOO/.ml 3.2 Hardness (ASTM D3363, ASTM D1474A): Pencil
6、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3H min Tukon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Information only 3.3 Adequacy of Cure (GM9509P). Ten double rubs with xylene or a supplier recommended solvent
7、 shall cause no appearance change, sokning of the film or significant color transfer to cloth. 4. SUPPLEMENTAL INFORMATION. 4.1 Application and Bake. The material must be capable of being applied from all common conventional spray equip ment. Nominal bake for these spotters is 30 minutes at 163 C. T
8、he supplier must provide complete data showing the viscosity-temperature relationship and circulation stability characteristics of the material. 4.2 Quality of Final Rinse Water Run-Off The collected rinse water dripping from the part after wet sanding shall be visibly clear and free of solid partic
9、les and have a maximum conductivity of 200 who/cm. 4.3 Sanding. The spotter may be sanded prior to application of topcoat to remove dirt or minor imperfections. However, all sanding dust must be removed from parts before topcoat- ing. If parts are wet sanded, deionized water must be used for final r
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