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Discussion Starter · #1 ·
Wtf.

Do any of the spray products from GW have a shelf life? Like the purity seal or the undercoat?

The other day I sprayed a model in the white undercoat, and it practically melted right before my eyes. I've been painting for more than 15 years now, and the spray was not being used incorrectly. However, the spray is more than one year old. My black spray had no such problem.

I just sprayed a newly painted model in 'purity seal', which is not old, and the same thing happened. The model turned white (a little like the residue that super glue can give), and then it lost all definition, and just smudged to the touch, as though it had melted.

Models destroyed. What the fooook.
 

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I am Alpharius.
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Yeah... Wrong section, the experts are down there in the modeling section...
 

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Yeah, but the experts are down there, so might be a bit harder up here where just some random people are spamming posts all night...
 

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Like you two, for instance?

Purity Seal has been known to do that on rare occasions. You need to check humidity and temperature before using GW sprays. One would think they'd give superior product for their prices...
 

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Discussion Starter · #7 ·
Like you two, for instance?

Purity Seal has been known to do that on rare occasions. You need to check humidity and temperature before using GW sprays. One would think they'd give superior product for their prices...
What sort of humidity/temperature is the product supposed to be used in?
 

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What sort of humidity/temperature is the product supposed to be used in?
Have not got a bottle here, but I would remember it saying something about "Do not use it in temperatures above 25°C, and that it should not be a wet area..."
 

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blahblahblahblah
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What sort of humidity/temperature is the product supposed to be used in?
I do it indoors at room temp, had no problems so far, unless you spray too long or heavily, quick light bursts are superior, leaving each coat of light spraying to dry properly.

as to white melting your models........well thats just weird, but I never use GW spray
 

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I am Alpharius.
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I do it indoors at room temp, had no problems so far, unless you spray too long or heavily, quick light bursts are superior, leaving each coat of light spraying to dry properly.

as to white melting your models........well thats just weird
Totally agree with you on everything this far (For the first time ever...), but it is also totally reasonable to do it outside if the weather is calm...
 

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First I've ever heard of any sprays melting models like that... I'd automatically assumed that you've not bothered to shake it properly to mix it correctly and got a ton of the propellant out of the can rather then the paint mix, or you've been using the can the wrong way up, which results in the delivery tube inside the can, not being in the liquid, and thus spraying propellant rather then paint again.

And its temps above 50oC, so that should be much a problem in most places....

Most spray paints only have a shelf life of about a year though before the paint can start turning funny and gumming up inside the can. As said though, its teh first I've ever heard of it ever melting a model.
 

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Discussion Starter · #12 ·
Yes, I'm aware that propellant can do that, and that not shaking it/using it too close can make mainly propellant hit the model.

However, neither was the case. Hahaha, 50oC isn't much of a likelihood, as I'd be dying.

Hmmmm... I might give GW a call tomorrow.
 

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humidity causes "fogging" and the last few days have been very humid in the UK, i risked doing a spray job yesterday (photo frame) and the black went on ok, the purity seal however looked like i had dipped the frame in flour, i sanded it and got out a brush and vallejo varnish.as for melting that seems unlikely as i dont think GW sprays have any solvents in that would cause that effect on plastic.



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i've had similer problems during high humidity, i tend to avoid spraying during these times now where possible.

Granted i sprayed 5 models yesterday with GW chaos black thats well over 2 years old but that worked fine.
 

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Discussion Starter · #17 ·
humidity causes "fogging" and the last few days have been very humid in the UK, i risked doing a spray job yesterday (photo frame) and the black went on ok, the purity seal however looked like i had dipped the frame in flour, i sanded it and got out a brush and vallejo varnish.as for melting that seems unlikely as i dont think GW sprays have any solvents in that would cause that effect on plastic.
The spray can does say on it "Solvent abuse can kill instantly", this indicating that it does indeed contain solvents. Whether or not they would do this to plastic is another question entirely.
 

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Humidity and year old spray could be the problem here as I know that in hot humid weather the spray goes on thick and gooey and will kill detail on the model but I have not had the melting effect before from a spray - I did however have a black spray that left solvent marks all the time no matter how much I shook and sprayed at a distance grrr...
 

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I don't know i've got some purity seal and black primer that are well over 3 years old (I got them both at the same time spray varnish became 'Purity Seal' so it might be longer I don't remember) and they both work perfectly fine- though as Stella mentioned I only use very short bursts.

It does sound, though, as if it might have been the conditions you were spraying in affecting the Spray rather than it's age.
 

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see what GW say when you call em, and if there not too helpfull, get an old bit of sprue, and do a test spray, see if it happens again, and if it does, take the can(s), sprue and knackerd minis to your nearest GW and show em, also make note of the conditions at the time of spray. as others have said, ive never hear of spray cans melting models before.
 
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