I still have some 10+ year old RM epoxy primer that I use for small parts that are not important and it still works fine even with the old activator.
I wouldn't use it for body panels, risk is too high.
Mix some up and if it still activates and hardens, then you can take your chances.
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Michael
Oshawa built 1 option Judge basket case. 463, SD KRE 295's, CNC'd factory intake, Cliff's Qjet, Stump Puller HR cam, RARE RA manifolds, Pypes exhaust, T56 Magnum, McLeod RXT clutch, 3.42 12 bolt. 24 year project almost done... 
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