Reply by Bill White

Junk. I started exhaling into the can just as I replaced the lid on all finishes. Remember that most of our air is a high nitrogen mix. Inert gas (nitrogen) helps prevent curing. Not a total prob solver, but sure helps.
Film wrap under the lid won’t keep the air from the finish. Placing the film ON the surface of the finish will help.
Think about what Bloxigen does.
I must add that I sure got some funny looks from my bride when she first saw me blowing into a paint can.
Bill

-- bill@magraphics.us