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Spraying in subzero temperatures
http://www.tacticalwargames.net/taccmd/viewtopic.php?f=7&t=19795		 Page 1 of 1
Author:  KivArn [ Fri Dec 03, 2010 10:56 am ]
Post subject:  Spraying in subzero temperatures
Is there any problem in spraying models in -2*C temperatures? (The sprays kept inside so shouldn't be that cold)

Cheers :)
Author:  Evil and Chaos [ Fri Dec 03, 2010 10:57 am ]
Post subject:  Re: Spraying in subzero temperatures
Probably. :-)
Author:  carlos [ Fri Dec 03, 2010 11:01 am ]
Post subject:  Re: Spraying in subzero temperatures
Main problem I found was in letting stuff dry in that kind of weather, but the problem wasn't w/ the cold but rather w/ the humidity...
Author:  Athmospheric [ Fri Dec 03, 2010 11:11 am ]
Post subject:  Re: Spraying in subzero temperatures
I once sprayed miniatures with mat varnish, while it was quite cold in the room. Definitely not subzero, but probably somewhere between 10°C and 15°C.

It resulted in a very strange aspect, like some sort of "orange skin" finish on the miniatures, both thicker, less transparent and specially much much more irregular than I expected it to be. I won't consider spraying anything with a can in less than 20°C in the future unless I can get substantial proof that it will be safe. I don't know if this was the result of humidity, coldness or bad can, but as I really think the varnish made my miniatures loose some details and contrast, and get an unpleasant surface, I have become quite wary anyway.

The only way I could convince myself to do it would be to perform some kind of tests, with the cans I intend to use, in the real conditions, and on a similar surface (plastic sheet at least, possibly an old mini), see how it performs AND how it dries, before doing the real job. But I might be on the extremity of "spraycanphobia" because of that earlier trauma.

I'm sure they are quite safe most of the time.
Author:  epic [ Fri Dec 03, 2010 1:27 pm ]
Post subject:  Re: Spraying in subzero temperatures
Hi Kivarn,
Yes the temprature will have an effect, Its not the room temp to be concerened with it, its the paint temprature and the temprature of the object you are spraying onto that affects adheshion of the pain. I used to use this this method when spraying car panels in cold weather..

Put the spray can in a sink of warm water and leave for a while { not boiling water just warm i.e bath temp! }
leave it for about ten minutes and then shake the can well to thin the paint.

Not sure what minatures your painting i.e metal or plastic, but if you can use a hair dryer, warm the objects slighty, the paint will adhere better and flow better on the model.

Main thing doesnt matter how cold it is, open a window as breathing in the paint vapour does your chest no good ;D

Regards epic
Author:  Legion 4 [ Fri Dec 03, 2010 6:18 pm ]
Post subject:  Re: Spraying in subzero temperatures
Well I set up a paint station in my garage ... and bring them into the (warm)house to dry ... :D
Author:  Ghudra [ Fri Dec 03, 2010 9:38 pm ]
Post subject:  Re: Spraying in subzero temperatures
Typical can of spray paint/varnish should be fine in that temp so long as you keep all elements inside prior to spraying and limit your exposure time outdoors. I usually set up my oven so it floats around 36°C and use that as a drying box during the winter.

Best option, of course, is to move to an airbrush for spraying.
Author:  KivArn [ Fri Dec 03, 2010 10:13 pm ]
Post subject:  Re: Spraying in subzero temperatures
Thanks guys :) it was just undercoating that i was doing, so no weird yellowing :)

Spraying all went fine, kept everything indoors till I sprayed (so about 20*C) then brought them all back inside as soon as i'd finished :)
Author:  Carrington [ Fri Dec 03, 2010 11:13 pm ]
Post subject:  Re: Spraying in subzero temperatures
Ghudra wrote:
Typical can of spray paint/varnish should be fine in that temp so long as you keep all elements inside prior to spraying and limit your exposure time outdoors. I usually set up my oven so it floats around 36°C and use that as a drying box during the winter.

Best option, of course, is to move to an airbrush for spraying.



Do you have any thoughts on what to use as an airbrush primer coat, or is anything special actually necessary?
Author:  Athmospheric [ Sat Dec 04, 2010 2:03 am ]
Post subject:  Re: Spraying in subzero temperatures
I don't have much experience with my airbrush, but a thin coat of black (I used citadel colour) worked fine for me. Diluted as for most paints when used in an airbrush (milk consistency).

Resin models have to be washed before, any grease will prevent the paint from sticking, but again you better wash them anyway, no matter what you plan to use : spray can, brush or airbrush.
Author:  Ghudra [ Sat Dec 04, 2010 7:17 am ]
Post subject:  Re: Spraying in subzero temperatures
Carrington wrote:
Do you have any thoughts on what to use as an airbrush primer coat, or is anything special actually necessary?


I like Vallejo's Model Air Grey Primer, Green Black, & White for primer coats. Using Testor's Flat Acryl or the Tamiya Flat Clear with other acrylics can also work well for primer.

I don't think you need anything special really, unless you are going straight for turp-based pigment washes or enamels right off the bat.
Author:  Dwarf Supreme [ Sat Dec 04, 2010 4:16 pm ]
Post subject:  Re: Spraying in subzero temperatures
Legion 4 wrote:
Well I set up a paint station in my garage ... and bring them into the (warm)house to dry ... :D


Done that, too. Works fine and the basement doesn't smell after spraying.
Author:  Carrington [ Sat Dec 04, 2010 4:30 pm ]
Post subject:  Re: Spraying in subzero temperatures
Dwarf Supreme wrote:
Legion 4 wrote:
Well I set up a paint station in my garage ... and bring them into the (warm)house to dry ... :D


Done that, too. Works fine and the basement doesn't smell after spraying.


For me, that'd be a good way of testing how well the landlord air-sealed the boundary between the garage and the house.
(It'd be much more of a concern if we actually parked the car in the garage... or if the house itself didn't leak like a sieve. )
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