Adhesion Loss,Plastic Parts
Description :Loss of adhesion of the refinish system and a plastic
part substrate. This defect is often noticed some time after the painting took place.
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ORIGIN AND POTENTIAL CAUSES
» Improper cleaning, drying (tempering) or preparation - failure to remove mold-release agents
» Improper treatment
» Wrong identification of substrate
» Failure to use proper sealer/primer
» Failure to use proper/recommended
topcoat system
» Clean and degrease the plastic part properly. -
PREVENTION TECHNIQUES
» Identify the type of plastic substrate and follow recommended paint system
for that specific type of substrate» Thoroughly clean substrate to be painted using recommended system
» Use recommended sealer/primer using the correct mixing ratio of recommended
activator, flexible additive and thinner» Apply sealer/primer to recommended
film build using recommended viscosity» Use topcoat as recommended for type
of plastic substrate to be painted» Where recommended, use a suitable adhesion primer for the type of plastic substrate being finished
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REMEDY
» Remove all finish layers from the substrate
» Refinish using recommended paint system and preparation for type of plastic substrate to be painted