Faces - In environments where humidity levels are high, corrosion can form between the paint layer and its metal support. When corrosion develops underneath a paint layer, it can actually push the paint off the surface of the clock face. Again, the best way to prevent this damage is by providing a stable and moderate humidity level for the clock. For this reason painted or varnished wood clocks should be exhibited and stored in an area where bright light is not allowed to fall on them. Heat generated from high light levels can also be a factor in causing damage to finishes.
Some varnishes can become soft and sticky when temperatures are high.
Soft finishes attract dirt easily and can become stuck to surfaces when left in contact for extended periods of time. Carpet beetles are generally found at joinery and inside clock cases. These holes are generally the first visible evidence of infestation. Wooden objects should be routinely moved and examined for infestation. The underside of legs and drawers should be inspected since insects generally hide in inconspicuous, dark places.