| If the poly cement still flows ok from the tube it sounds like the solvent hasn't evapourated so it should work fine.
On the subject of glues expiring - whats the best method of storing superglue? It irritated me when I purchased some Pacer Slo Zap and after about a month it's now unuseable as it's all stringy and thick!
I'd taken care to ensure the cap was seated properly and it also had an outside top which was fitted. I had the same problem with some Loctite Superglue too. For around £5 a bottle thats a bit irritating having to bin it after a couple of uses.
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