Protecting Glass Mirrors
Question: We produce silvered glass mirrors in all shapes and sizes.
We produce silvered glass mirrors in all shapes and sizes. We are toying with an application for using a mirror outdoors. Corrosion will be a problem, so we need to protect the back. Could you suggest a paint coating or coatings that will protect silvered glass mirrors from corrosion in an outdoor environment? K. M.
I know very little about mirrors. In fact, I try to avoid them. One look at my photograph in Painting Clinic will tell you why. Since you need corrosion resistance, I suggest applying a two-component epoxy primer to the silvered back of your mirrors. Another paint to consider is a two-component polyurethane. Actually, any moisture-resistant paint having excellent adhesion is a good candidate. The surface must be clean (free from oily soils, polishing and grinding compounds, as well as loose particulates) and dry before painting. It is important that the paint be applied beyond the edge of the silvering, so that moisture does not creep under it.
Simply heating up the substrate does not cure the coating. There are many variables to consider when choosing the best cure oven for your application...
Masking is employed in most any metal finishing operation where only a specifically defined area of the surface of a part must be exposed to a process. Conversely, masking may be employed on a surface where treatment is either not required or must be avoided. This article covers the many aspects of masking for metal finishing, including applications, methods and the various types of masking employed.
Coating problems and solutions associated with particle size reduction...