Thermal paste longevity?

I bought a tube of arctic silver 5 thermal compound to replace burnt-out thermal paste in my laptop about 3 years ago, and I was wondering if anyone had a quick answer on whether it is likely still good or not. I'll be building a new system in the next few months and if i can save a measly $5-$10 by using some of what's left it would be nice, as from what I understand the pre-packaged thermal paste on cpu's isn't that great. A single tube of the stuff is more than I'll use in a lifetime, it'd be nice if it lasts that long.

Great, guess i can save myself $5.
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  1. It should still be fine as long as it hasn't dried out.
  2. Best answer
    Like Shadow703793 said you should be good if the tube hasn't dried out. I've been using the same tube of AS5 for like 4 or 5 years and the last application that I did (2 months ago) applied and cured properly.
  3. Best answer selected by AnUnusedUsername.
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