Whether you simply hang a small oval in a gilded frame over your sink, or cover every available inch of wall with plate-glass mirrors, a bathroom doesn't look complete until the mirror is hung. As part of our glazing business in Brewster, Mass., my husband, Paul, and I cut and install numerous plate-glass bathroom mirrors every year. With that experience, we've developed good techniques -- along with definite opinions -- for working with mirrors.

The multilayered process used to create mirror glass involves an initial application of a sensitized layer of tin to the glass, for adhesion. The second layer, of silver, is applied for reflectivity, and a third, copper, layer is added to protect the silver. The Guardian Industries mirror glass we purchase (from Karas & Karas Glass in South...

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