I have a can of Liquid Glass that's been in my supply closet for about two years since I made the switch to NXT. Never been kept outside or frozen otherwise, should it still be good to use? Since I now have a red truck again, I think I remember the Liquid Glass looking better on the red then the NXT when I had my 98 STX - it definitely beads water better - that I remember for sure. Thought I might try Liquid Glass once again if I have another warm day this winter to do a detail... The NXT was definitely kickass on my Sonic Blue truck! (is NXT normally better on darker colors?) Another thing is the NXT can streak if the conditions aren't near perfect and I used Liquid Glass for about four years and it never streaked!

 

Should be fine pending that it's been stored correctly -- as you mentioned. I'd definitely shake the heck out of it before starting and, to be absolutely sure, test on an inconspicioius panel or part before going the distance.