Neal, please keep me posted on how the how the gas works out. I really like this stuff as well, however in all fairness, haven't tried Dektol either. One possibility I was considering, was to separate into smaller bottles with no air. The bottle I was using was one of the larger qt. bottles, which as you pointed out = this stuff ain't cheap, and was 1/2 full (or 1/2 empty for those that see things that way!!) and was opened on 11/9. Had some Ilford Universal sitting around for 6 months that held up much better.
Does anyone have any experience splitting chemicals into smaller qty's/containers? Seems like we did this quite a bit when I worked in a medical lab( you know it's funny, got out of that field because it became to automated...missed the science of the older process, kinda like darkroom work).