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Hey folks of Dakka!

Just got a question regarding GW's undercoating spray (both the Chaos Black and Skull White).
Atm I have two cans of undercoat spray, both about 1/3 full (or so, from what I can tell from what's sloshing inside it), but they've been sitting there in my closet for a while (over 6 months, at least), and I'm about to go undercoat some more models of mine in preparation for more painting. So my question is this;

Does undercoat spray have a 'best before' that I should be aware of? As mentioned, I've kept them cool, dry and out of the way for many months, but the last thing I want is to whip out my models, and spray them with these cans only for the whole thing to be ruined somehow.

Cheers.

I'm not really sure, I have a can of Chaos Black that is about 5 or 6 years old and it doesn't work too good even after a lot of shaking, but I've used cans of GW white primer that are a good 2 or 3 years old and still worked fine. 6 months I'd imagine would be no problem, just make sure you shake it plenty good. You can always spray a test piece like a sprue first, but 6 months isn't really all that long.

I have a can of the old Skull White (the blue can, with the old Citadel logo). It works just fine.

I had a few year old can of black sitting in the garage for about 4 years,and it worked fine, but after drying it was a little bit more "powdery" feeling then laying down a prime coat from a fresh can.. The reason I noticed it is because I was trying to cheat by leaving my black Templars primed black instead of going over them with a base layer of chaos black, but it still worked..

I dug out a 10 year old can from 2001 when I started 40k again last year and it worked normally. It was unused and stored in a box in the cellar though.

Shandara wrote:I dug out a 10 year old can from 2001 when I started 40k again last year and it worked normally. It was unused and stored in a box in the cellar though.

I primed something yesterday with a can of Skull White primer I've had since... I dunno, maybe 2000 or 2001? The price tag said $7.99, so I know it's been a while. I would imagine like any chemical, there are a ton of factors that would come into play: time, temperature, chemical makeup, exposure to oxygen. When in doubt, test it on something you wouldn't care about destroying such as an old piece of sprue or cardboard.

Thanks guys. I got plenty of sprue frames lying around so Ill just test it on them first. Cheers