Shellac unstable?

I have heard from a very reliable source that after one year,. shellac becomes very unstable. Is that true?

Answer:
Dry shellac flakes in a sealed container are stable - i.e. they will not degrade or oxidize. Once dissolved in ethanol, they will begin to react to form ethyl esters, which will make the finish "gummy." The shelf life of premixed solutions is ca. 2-3 years.

Once applied to wood, it will oxidize and darken over time, but the aging process takes many years.

To answer your original question, shellac in solution may degrade to the point of being unusable, but it is not unstable in the chemistry sense of the term - you're not going to blow yourself up by using old shellac!
Yes, it is true.

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