Colored Varnish for Marking Glass

Ask an Expert From: Products Finishing,

Posted on: 6/3/2013

Can I use some sort of clear lacquer to mark safe work zones on pressure and temperature gages with glass covers?

Q. Our factory uses pressure and temperature gages with glass covers to control our processes. I need to mark the safe work zone of the surface of gages so that our operators can easily tell when processes are within parameters. Markings must be made with a clear material that is a bright green color. Permanent markers and transparent stickers do not work because they can be removed by the high-pressure steam we use very often to clean our machines. Can I use some sort of clear lacquer to mark the zones? J.B.

A. Yes, you can use a colored clear lacquer for your markings, but a colored clear varnish would be better. Lacquers, in general, use thermoplastic resins as vehicles and may not be able to withstand the high-pressure steam cleaning. Varnishes, which have more robust vehicles, should be able to withstand the cleaning process. An epoxy-resin-based varnish colored using a green dye should work for your application.

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