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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing since 1989
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Stop-off (masking) for chrome plating on plastics
Q. We are a third tier supplier of OEM automotive parts. We spray paint stop-off lacquers on ABS and ABS/PC plastics prior to the chrome plating process. Sometimes the chrome over runs the stop-off paint and causes reject. What other then low DFT could cause this problem. The paint needs to be at least 1/2 mil thick when dry. Can over-etching or over-activation cause this. What else and how to determine it?
Rich Hardway- Cleveland, Ohio, USA
2003
A. There exist two different ways for masking. Enthone Omi had a product (stop-off is a polymer and you can apply by spray); other way is paint (Red Spot Paint had this kind of paint, I don't remember the name but you can get the information by internet.
I hope this information helps you.
Gabriel Ramirez- Toluca Edo de Mexico
2003
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