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· Senior Member
7,222 Posts
Some finishes start to react with the small amount of oxygen in the air once the container has been opened.

You may get slightly longer life if you purge the container with Bloxygen or some other chemical. I use CRC Duster. A lot cheaper than Bloxygen. I do not get as much skin on the poly when I purge the can. It will eventually go off though.
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