Resin, a principle ingredient in varnish, is considered nature's "master stroke" in preserving the fiber in wood. Wood properly treated has wonderful durability, so a sound board properly treated with varnish helps preserve its integrity. But there are many types and qualities of varnish, each for its own purpose. What follows are a few vital hints in connection with the use of varnish on sound boards.
Keep unused portions of varnish away from the open air as much as possible. Keep brushes perfectly clean, and brush out the varnish rapidly from spare dipping as thinly as can be smoothly done in each coat to be used. Plenty of time must be allowed between coats. This will give the finished product an elasticity of surface it cannot have any other way, will help avoid cracking and consequently will prove almost impervious to moisture.
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