How long can primer last outside without a topcoat?

Joe asked 4 years ago

We sanded and primed our outdoor deck last fall but were unable to find the time to paint it before the New England winter came. The primer has been on all winter and has some wear where it sees heavy foot traffic. Obviously I will re-prime the spots where the primer has worn away but how should I prepare the other primed areas which still look good? Does primer lose its quality if it sits exposed outside too long?

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