PAINTS AND STAINS ON WOOD - PRESERVATION AND DECORATION and stains are used for two purposes—first, to preserve timber; and second, to secure decorative effects. Paint acts as a wood preservative because it closes the openings in the wood and prevents the entrance of moisture and decay-producing organisms. A thoroughly seasoned piece of wood Will last indefinitely if kept well painted.
The general distinction between paints and stains is that a paint is an opaque covering which to a greater or less degree conceals the natural appearance of the surface to which it is applied. A stain or varnish on the other hand, either brings out more strongly the natural appearance of the wood, or modifies it to a degree depending upon the character of the stain without obliterating the natural figure. Paints are more largely used for exteriors, where protection is the chief object; and stains for interiors, where decorative features are the main consideration, although paints are also much used for interior work.