I have pint and quart cans of Aero Gloss from the 60's that are older than I am that are full, and totally good for use. The cans of Sanding Sealer and Balsa Fillercoat I use most are from the late 70's/early 80's.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, AGITATION, CHAOS, TURMOIL, FIASCOS, AGGRAVATION, INSTIGATION, NUISANCE-ACTION, and HAVOC !