How long is BW good for?

I've got a couple of bottles of BW that I used a couple of times and then they have been kept in a cool, dry place but I've had them for almost a year without using them. Are they still OK to use or should I just order a few more bottles just to be safe? What do you guys think? thanks bro's.

anyone?

I believe the manufacturer says 24 hours post puncture, but it should be good for 30 days if kept in the fridge