JoeTaxpayer wrote:
...

The can was untouched for years, 7-8 my guess. My basement is 65 in
winter, maybe 75 in summer. I should have trashed it 5 years ago.


According to Bob Flexner's book _Understanding Wood Finishes_
shellac is acidic and shellac cans are coated to prevent
corrosion. So maybe after eight years or so the coating
broke down and the corrosion generated enough gas, hydrogen
I would think, to overpressure the can and pop it.

What is the condition of the inside of the can?

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FF