I was going to answer "fresh glue". (Can you tell I use CA?
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Frame Fast trade grade is in the 100-300CPS range, good stuff for meshes between 125 and 305 mesh--haven't had problems with it on those counts.
I try not to buy more than I'll use in a year or two, it definitely has a shelf life.
I've heard good things about the two part polyurethane (IIRC, Rhino-mite was the name I saw) but haven't tried it--anyone have experience with that type of glue?