Certainly, as you say, Shellac should be tightly closed and kept in an ambient temperature and out of sunlight. If not used Shellac lasts a good long time.
I have a collection of Shellac colours here at home (in Spain) and I only ever use a few favourite colours on myself. I have had some for over 2 years! When I use them to demonstrate in a class they always behave normally and no funny ones yet! lol I do give any bottles I have not used in ages a shake for a greater than normal amount of time before using. Really I have used them for demos to see how well they have lasted .. not come across a problem so far. Still they wont last forever. The less Shellac in the bottle, the more the product will deteriorate if left standing because of evaporation into the void in the bottle.
On the contrary I have had coloured gels that when I have gone back to them after 7 months of non usage, I found the the brushes were frozen into a completely cured nearly full bottle of gel. Kept in the same cupboard as Shellac with lids tightly closed, but I think the 'peep hole' on the label does let enough light in to cure the product eventually if left for too long. Many others have told me they have had the same experience.
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