"Red box" Acra-Glas changed somehow about five years ago. The resin partially hardens on its own after time. I once called Brownells about this, and while they admitted to the problem, could suggest no solution - other than buying a new package of the stuff. Now that I think about it, that may be the psychology behind the resin hardening...
Nonetheless, it's the best stuff out there. And it's not that expensive.
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