This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
If a waterproof stiffening is required use one of the varnishes for which formulas follow:
Copal........... 450 parts
Sandarac........ 75 parts
Venice turpentine 40 parts
Castor oil........ 5 parts
Alcohol......... 800 parts
Shellac.......... 500 parts
Sandarac........ 175 parts
Venice turpentine 50 parts
Castor oil........ 15 parts
Alcohol.........2,000 parts
Shellac.......... 750 parts
Rosin........... 150 parts
Venice turpentine 150 parts
Castor oil........ 20 parts
Alcohol.........2,500 parts
 
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