I just went to DIY some juice last week and discovered that my VG had turned from being very viscous to a consistency more like water.
It still taste like VG, but when vaping the amount of vapor produced is significantly dimished. My though is water get into it, although it is a sealed container. I've only had this 1L container for a few months so compared to other bottles it seems like its shelf life is short.
I ordered a large amount of PG and VG from ED almost 2 years ago. As soon as I got it, I decanted both to large amber glass bottles with polycone caps and put all the bottles in my basement (in box, on floor - so cold, dark place).
I'm getting down to the last of them now, and they're still just as good as the day I got them. Bottom line? As with so many things, it depends how you store them.
shelf life of VG is about 1-2 years, definitely should still be fine after a couple months.
Maybe you left the cap off for a bit without remembering? What brand are you using?
I ran out of VG one week and was desperate and ordered this:
http://www.amazon.com/Glycerin-Vegetable-Kosher-USP-Quart/dp/B004C7MTLA/ref=pd_bia_nav_t_2?ie=UTF8&refRID=1AJSA6ERSDT4C8GGSMXP
Vapes fine, but apparently the seal is bad.
Glycerin Vegetable Kosher USP - 1 Quart - net wt 43 oz
|||| --:|:--|:-- Current|$11.97|Amazon (3rd Party New) High|$21.82|Amazon (3rd Party New) Low|$6.81|Amazon (3rd Party New) |Average|$11.97|30 Day
I guess you aren't the only one having recent issues with essential depot.
FWIW every batch of EO VG I've ever had was subpar. I also have noted weird max VG blends from others and asked them if they bought EO and the answer was 100% what I expected.
Wonder if their direct VG is better than the Amazon sku.
Nudenicotine has good bottles, never had this issue. Definitely sounds like your vg took on airborne moisture, though. You can keep it around to thin out max VG juices if you're not skeptical of the bacteria. It's like adding distilled water, its just not 100% clean.