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 Post subject: Vallejo Model Air
PostPosted: Mon 09 Jan 2017 15:00 pm 
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Hi all

I've started to use Model Air now as I love the finish you get with these paints. My only problem is that they always take all night to dry. I only ever put a couple of drops of Vallejo thinner in there if they need it.

I'm used to spraying Tamiya colour. Perhaps I need to change my technique?

Anyone else had this problem?


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 Post subject: Re: Vallejo Model Air
PostPosted: Mon 09 Jan 2017 15:08 pm 
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No, when I use them they dry fairly quickly, usually dry to the touch within 30 - 45 mins.

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Last edited by spitfire1677 on Mon 09 Jan 2017 16:54 pm, edited 1 time in total.

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 Post subject: Re: Vallejo Model Air
PostPosted: Mon 09 Jan 2017 16:49 pm 
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I use Model Air a lot. I have found only the primer to consistently take a long time (overnight) to dry but the normal colours should dry within 1/2 an hour or so. Also, you don't really need thinner with these paints as they are designed to be used straight out the bottle! As an aside, diluted paint should actually improve drying rates as water evaporates quicker. I have on occasion come across the odd paint that seemed to take longer to dry than normal, so perhaps a certain colours are prone to it?


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 Post subject: Re: Vallejo Model Air
PostPosted: Mon 09 Jan 2017 16:51 pm 
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That could make sense; I know that I find that Revell gloss enamel reds take forever and a week to dry out!

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 Post subject: Re: Vallejo Model Air
PostPosted: Mon 09 Jan 2017 19:33 pm 
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I've never had to thin VMA, it's always the right consistency and dries in 20 - 30 minutes :P

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 Post subject: Re: Vallejo Model Air
PostPosted: Tue 10 Jan 2017 10:12 am 
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This is what everybody says. These paints are quite dense - perhaps I'm putting it on too thick?

I find certain colours (Ivory Sand being an example) need a couple of drops of thinner otherwise they clog a bit.

I'll persevere of course. It's just annoying losing a day when you don't have that much time!


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 Post subject: Re: Vallejo Model Air
PostPosted: Tue 10 Jan 2017 10:29 am 
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More haste less speed :lol:

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 Post subject: Re: Vallejo Model Air
PostPosted: Tue 10 Jan 2017 10:53 am 
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Mr TEL, just a couple of questions. What is the size of the nozzle you are using for your airbrush? Have you given it a good clean and, if you are using a compressor, what is the pressure you have it at?


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 Post subject: Re: Vallejo Model Air
PostPosted: Tue 10 Jan 2017 11:26 am 
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Its a an Iwata HP BS and I normally use the 0.5 nozzle. The compressor is at about 15 psi.

I always clean it after use, and don't get many problems. It's just that some Vallejo colours don't go through properly without a drop or two of thinner.


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 Post subject: Re: Vallejo Model Air
PostPosted: Tue 10 Jan 2017 11:40 am 
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Vallejo do say adding thinners in the ratio 1:3 is 'recommended', although this seems to contradict their statement (and the experience of other users) that the paint can be used straight from the dispenser (providing it flows evenly). I'm a bit surprised to see they recommend a 0.2mm nozzle for modelling use, I personally would stick with your 0.5mm or even go up to a 0.7mm, but your pressure could be a little high, Vallejo recommend values are between 0.5kg and 1 kg (7 to 14 psi). Have you tried their tip for improving drying time, i.e. blowing air from the airbrush onto the painted surface?

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 Post subject: Re: Vallejo Model Air
PostPosted: Tue 10 Jan 2017 12:07 pm 
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Mr Tel, all sounds good. Personally, I have my compressor a little bit higher at 18 PSI as I find that if it's low the paint doesn't get blown through and clogs up sooner leading to 'sputter', but that's just my opinion. Dordogne Dodger, I agree. I've tried a 0.2 nozzle and it doesn't seem to work without being thinned heavily.


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 Post subject: Re: Vallejo Model Air
PostPosted: Tue 10 Jan 2017 12:12 pm 
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I haven't tried blowing it but thanks for the tip.

I too found it strange the way they boast about using it straight from the bottle, then (literally) in the same breath recommend thinner. As you say, The 0.2 thing is too fine for modelling; I used to use one that fine for ink and photo dyes in the old days before Photoshop. You can still draw small dots and lines with the 0.5 if you're careful. Didn't know they did an 0.7 though.

I'll try taking the compressor down a notch too. :thumb:


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 Post subject: Re: Vallejo Model Air
PostPosted: Tue 10 Jan 2017 20:21 pm 
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I have my pressure set as low as possible - just a puff - enough to get the paint to shoot though - about 8psi or thereabouts :juggle:

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 Post subject: Re: Vallejo Model Air
PostPosted: Tue 10 Jan 2017 20:27 pm 
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Ratch wrote:
about 8psi or thereabouts

That's about what I have mine set to :thumb:

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 Post subject: Re: Vallejo Model Air
PostPosted: Fri 13 Jan 2017 10:42 am 
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8 psi eh? Is that with a standard type of regulator, or can you get a special precision one? It would take a lot of fiddling to get mine that low, and then it would be very approximate. I'm guessing you build up your finish with a series of very thin coats too?


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 Post subject: Re: Vallejo Model Air
PostPosted: Fri 13 Jan 2017 12:04 pm 
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I don't know if its exactly 8psi - I turn the regulator right down (no air) and unscrew little by little until the paint sprays. Its about getting a feel for your tools :wink:

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 Post subject: Re: Vallejo Model Air
PostPosted: Fri 13 Jan 2017 12:35 pm 
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Mr TEL wrote:
8 psi eh? Is that with a standard type of regulator, or can you get a special precision one? It would take a lot of fiddling to get mine that low, and then it would be very approximate. I'm guessing you build up your finish with a series of very thin coats too?

My compressor has a wee gauge on it with increments on it, just twist the knob to increase or decrease the air pressure. Yes mate, its the same a brush painting, many light/thin coats are better than one heavy pass.

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 Post subject: Re: Vallejo Model Air
PostPosted: Thu 01 Jun 2017 12:37 pm 
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Back again guys

Had a terrible time with Model Air this week. Tried to paint a German Dark Yyellow base with Dark Green and Rotbraun camo on top. I had to do two coats of the base colour as the first one started beading like water off a duck's back in some places. I had the pressure down low too. Then I did the camo stripes, also at low pressure. I was trying to achieve a 1/8 inch line with the airbrush, but it came out very spitty and coarse. The Italeri Tiger I on the shelf from a couple of years back reminds me that I did a good job then with a similar scheme, using Tamiya paint and with no problems. The only plus was that it dried within 30 mins or so this time.

So I think I've reached the end of the line with these. Incidentally I used Tamiya primer - would that have made a difference?


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 Post subject: Re: Vallejo Model Air
PostPosted: Thu 01 Jun 2017 13:47 pm 
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It may or may not have done. Is Tamiya primer an enamel or a spirit resin acrylic like their normal paints?

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 Post subject: Re: Vallejo Model Air
PostPosted: Thu 01 Jun 2017 14:56 pm 
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It's definitely acrylic.


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