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GMW16680 2nd Edition, June 1, 2017 Sealers, Paint Shop, Pumpable, for Waterborne/2K, 3-Wet, Non- Compressed, Compact Painting Process, Generic Qualification
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Description / Abstract: This specification details the performance requirements of a family of sealers designed to be compatible with the three (3) wet compact painting process which uses waterborne basecoat plus Two (2) Component (2K) clearcoat topcoat systems. The materials are, applied in the paint shop after the Electrocoat (E-Coat) bake. They must be capable of being either manually or robotically applied. The materials are intended to seal interior and exterior body joints against water, dust, air intrusion and corrosion. The family of materials include: High Appearance Paintable, Ultralight and Abrasion Resistant Rocker Antichip/Under Body Sealer/Under Body Coating Sealers.
Material Description. The materials must be a smooth and homogeneous mixture free of air, lumps, unmixed particles, or foreign materials.
The materials must be capable of being dispensed with approved and validated; production displacement pumping and application equipment including (depending upon material type and application): single/multipoint streaming, flat stream, automated hem sealing and airless fan spray and airless spray with rotary masking. Dispense testing shall be conducted through production Manufacturing Systems Qualification (MSQ) validated application equipment appropriate for the type of sealer material and application process.
Must not have a noxious or toxic odor in either the uncured or cured state.
In addition, the materials must not adversely affect those personnel handling them.
The materials must adhere to all approved production E-Coats. They must not have corrosion causing ingredients.
Symbols. Not applicable.
Applicability. The materials validated and approved under this specification are formulated to be compatible with the three (3) wet non-compressed sealer and topcoat bakes, painting process and topcoat materials. The placement of application on the vehicle is determined by the type of material. The abrasion resistant materials are typically used as rocker anti-chip and/or underbody coating. The ultralight material is typically used for all interior and underbody seam sealing. In addition, the high appearance paintable material is typically used to seal "appearance" joints that receive subsequent finessing/skiving.
Material Description. The materials must be a smooth and homogeneous mixture free of air, lumps, unmixed particles, or foreign materials.
The materials must be capable of being dispensed with approved and validated; production displacement pumping and application equipment including (depending upon material type and application): single/multipoint streaming, flat stream, automated hem sealing and airless fan spray and airless spray with rotary masking. Dispense testing shall be conducted through production Manufacturing Systems Qualification (MSQ) validated application equipment appropriate for the type of sealer material and application process.
Must not have a noxious or toxic odor in either the uncured or cured state.
In addition, the materials must not adversely affect those personnel handling them.
The materials must adhere to all approved production E-Coats. They must not have corrosion causing ingredients.
Symbols. Not applicable.
Applicability. The materials validated and approved under this specification are formulated to be compatible with the three (3) wet non-compressed sealer and topcoat bakes, painting process and topcoat materials. The placement of application on the vehicle is determined by the type of material. The abrasion resistant materials are typically used as rocker anti-chip and/or underbody coating. The ultralight material is typically used for all interior and underbody seam sealing. In addition, the high appearance paintable material is typically used to seal "appearance" joints that receive subsequent finessing/skiving.