Somewhere I have a response from U.S. Composites on this very subject. If I remember correctly they stated that as long as the resin wasn't lumpy or gelled, it should be OK. They also mentioned that the MEKP usually goes bad before the resin, and a quick way to check it was to vigorously shake it and see if it kept bubbles.
Mix the resin thoroughly and run a little test batch to see what happens. If it cures properly, I wouldn't hesitate to use it on little, non-critical parts. I did that once and my test batch kicked off just fine, but when I laminated with it, the part didn't cure until I set it in the hot sun for several hours.
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Brian
1981 Mako 17
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