BrentD,
Albumin was used for many years as a sealant, perhaps because it was sealed in by oils in hopefully dry conditions originally, moisture was not too much of a problem in reality. Pineknot,
Most Antique Oils to my knowledge may also be called Danish Oil which just happens to be formulated from Tung and Linseed oil.
Many of my old recipes include the ingredient Vinegar.
Why? what properties does Vinegar have?