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Airbrushing

23089 Views 64 Replies 24 Participants Last post by  Richard Johnson
I don't know if this is a topic we have discussed before however it seems like a good idea to bring any thoughts, hints and tips on the subject together in one thread.

Several thin coats are much better than one or two thick coats and a priming coat is always a good idea no matter which material is being painted.

It is a good idea to obtain a large card box and create a spray room within it with a turntable upon which you can place the subject. This keeps the paint within a contained area and being able to turn the model rather than you having to work your way around a static model makes airbrushing more manageable.

Why don't a few of you give it a go on an old loco body that is a bit tired?


You may be able to create that loco that you have always wanted but which the manufacturers always seem to overlook!


And of course airbrushing works well for scenic backdrops, buildings and other model railway subjects. You can practice on a cheap Dapol kit before progressing to something more expensive.

Happy modelling
Gary
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Did think that myself about the tape tip. Maybe if you use a lint free material if such a beast exists.

What are the ideal masking solutions as standard tape is a bit thick.

Happy modelling
Gary
I've heard it suggested that you stick the tape to glass a couple of times to reduce the tack though this was said in relation to masking tape. A tip for you that I use. Several years ago I built a selection a model starships, USS Voyager was the first time I'd used an airbrush and the instructions called for the windows to be fitted from the inside before it was painted they suggested using a liquid mask before painting so off I trotted to the model shop to find this liquid mask. Upon getting it home and using it I found it bore a striking resemblance to Copydex, so guess what I use now when I need a liquid mask?
Arethusa
Pedro an aerosol can will not give you an even covering as they are not controllable enough, and you cannot get into small restricted areas with them for this very reason. Make up brushes are far to big too also giving little controllability, when using pastell I apply it with No1/2/3 sable watercolour brushes, which are time expired from painting duties.
http://greengoscalerail.fotopic.net/p35213895.html

You may not be convinced by the 37, I'm not sure what that means but bear in mind the size of the enlargement that that image has gone through, it was also take in artificial light which doesn't help the color cast. Whats not convincing about it? It was done from a photo for the purchaser, I only ask as you're the only person that I've heard that comment from, and hailing from the RMweb lot, they're not usually shy about coming forward


Aztec are excellent brushes, there are no issues with the plastic ones they are solvent friendly. They are widely used by the military and car modelling fraternity, and I'm waiting to get one. The last thing they are is a gimmick. The interchangeable nozzles are reported by my brother to be brilliant for speed of work and cleaning, its plenty robust too he's been in the states for many years now and had to buy his after he left his badger in the uk, wonder who got that then?
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As far as masking goes in the past I've used masking tape and selotape, taking the tack off my placing it on my jeans and pulling, never had any fluff issues yet. However the best masking tape bar none on the market is that made by Tamiya, and I've been using it for years. It's formulated for model makers and can be cut, bent, pressed and cajoled into pretty much any crevise you desire, and gives fine lining too as its so thin.
For my sharp edges, for the past six or seven years I've used the Tamiya tape, and then then use high st masking tape and newspaper, (depending on the model size) for the overspray areas. I'd never go back to the selotape now though, but still use large masking tape desensitized on my trouser leg!
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papa. i think we are going to have to disagree on the weathering issue and the aztec brushes.
I did take a picture of my big boy that was weathered withought an airbrush but sadly i forgot to review the picture and when i got to work and viewed it it was far too dark.


"You may not be convinced by the 37, I'm not sure what that means" i didnt think it looked realistic. it was better than the factory weaathering that hornby and bachmann do. but your WD was very good.

The interchangable nozzels are a gimmick. admitidly they should be much easier to clean but if a needle and nozzle are well enough designed then there should be no need for the small/medium/large nozzle. a double or tripple taper will do the job just as well.

I use the tamiya tape too. it comes in a nice dispenser thats totalle rubbish but it does keep it clean which is half the trick with masking tape.
I have been hearing good things about eurostar masking tape. but i havent used it personally yet.

Peter
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I use an Aztec double action airbrush. I switched after using a Badger for 15 odd years. I prefer the Aztec it's superior to use and much easier to clean. I do mainly use Acryllic paints, I use Windowlene to clean it.
I have several other airbrushes for course work, but for precision it's the Aztec for me.
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out of interest what thinner/pressure/distance do you use for spraying acrylic?
i had a go with acrylics about a year ago but i wasnt happy with the results. but i know it was my technique rather than the paint. it either wasnt going on thick enough to cover or it was running all over the place! i love the idea of cleaning with windowlene! i once put myself in moorfields eye hospital by blowing cellulose paint thinner into my face using an airbrush.

Peter
I must admit to being convinced by the 37 weathering job and its great to hear the positive feedback on the Aztec airbrush as the modeller at the Warley MRC was very sure of its benefits also. He uses both enamel and acrylic paint and even older enamel paint with lead in it!


This has to be a product worthy of further investigation.

Happy modelling
Gary
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When you are painting using an airbrush, do you tend to create batches of stuff to do to get the maximum value out of the paint you've thinned for spraying? I've now got 4 box vans and a 5 plank wagon which are ready for spraying in BR Bauxite with grey roofs and am wondering if this is enough or do I need to build some more?

David
David it varies completely for me, if i'm doing a colour that I widely use then yes I will try and batch paint so to speak. Never forget however you always need to mix more paint that you actually need, it prevents it running out just before completing a job, not that I've ever ever done that, oh no, not me....
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Thanks for that papamikepapa.

When painting a box van is it best to start top to bottom masking as you go or bottom up?

David
Had to think about this one, been a while since I did any vans. Assuming its a BR standard bauxite or grey van, I do the chassis first. Mask the body and roof, and get a good quality masking tape like Tamiya for the edge. You can 'fill in' the larger areas with a cheap tape or newspaper. I then use Halfords matt black acrylic car touch up spray. Gives a nice even flat coat. Needs to be held at least 9 inches off the model though, and do several passes with it. Too close and you'll flood the details of the chassis. This will dry in 15 minutes or so. I then reverse the masking using the solebar, (usually where the colour change takes place) as the fix for the masking tape. With a quality tape like Tamiya it can be cut and placed on some of the fine detail without a problem, as it's low-tack. Then I spray the body colour, wait till that dries, remask the body and do the roof. Once that is dry all the masking can come off and then I'll touch up any areas that need it with a paint brush. Areas for transfers are given a high gloss coating to help adhesion and hiding any carrier film. After transfers are applied then an overcoat of matt (or rarely satin) varnish seals them in before weathering.
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Thank you very much, that sounds good to me.


David
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Everything Airbrush do good air brush kits that contain the comopressor, hose and air brush. They are not hugely expensive either. The compressors and air brushes are not branded, more the blank chinese things but suprisingly, they are pretty good. They are not as you would get with iwata, or a better manufacturer but they are not bad at all. The only thing i will say though, the compressor is not capeable of producing a consistent 40psi output, the brush uses more air than the compressor can produce, so its a little bit stunted in that department.

On the whole though, its pretty good.

Also, dont ever get a gravity feed, they are a pain in the nuts to clean, the suction feeds with the removable jars are muuuch better.
I tried one of those. its identical to the vivaz i spoke of earlier in this thread.
I think it would be great for inks and very thin acrylics but for enamals it just didnt work. its far too fine and it clogged at evry opportunity.
The compressor is fine for airbrush use. but get a better/longer hose for the reasons i stated at the beginning of this thread.

If anyone is in london and wants to compare a decent airbrush with a bad one i would e happy to let them have a go.

It went back after about a week.

Peter
Hmm, i found them ok, aslong as you use proper air brush paint. You can use enamel paint, aslong as you thin it with white spirit first, its fine.

I just finished painting a tunnel mouth with the suction feed, when its dry il post some pictures.....
Tadaaaa

I did that with my cheap everything airbrush brush using the revel paint from the local model shop.

I shot all the dirt off the mouth with an abrasive gun, then painted the whole thing brown, then individualy painted the highlighted bricks with a rusty orange paint. Then i used a gloss euro red to mist over the entire thing to make the orange more firey. Then i misted the original brown back over the top again.

I think it looks pretty good....
"Hmm, i found them ok, aslong as you use proper air brush paint. You can use enamel paint, aslong as you thin it with white spirit first, its fine."

For the majority of railway colours you cant get "propper airbrush paint".
White spirit is a very poor reducer for airbrushing. its just too slow. you will end up doing about 10 coats. its much better to use a faster thinner and do it in 2 or 3 coats.

I hab problems with the vivaz clogging when i used both phoenix and tamya paints (the tamya acrylic was thinned with their own brand of thinner specially for the purpous and the phoenix was thinned with their own brand QAD)

Once again there is an open invitation for anyone who fancies having a go.

Peter
QUOTE (Gary @ 14 Oct 2006, 15:12) <{POST_SNAPBACK}>I would guess that if you airbrush the track you simply use a track rubber or fine sandpaper to remove the very thin coat of spray from the top of the rail. Care might be needed around points. However if you seperately wire the point blades to the main rails from under so that you are not relying on the point rail itself to conduct power then this is not an issue.

Happy modelling
Gary

Hi Gary,

This post might be a bit late but I only joined the forum recently.

Just a friendly word of advice. Never clean your tracks with sandpaper no matter how fine it is. You will eventually just compound the problems of dirty tracks. Take a new piece of track and clean it with sandpaper. Now have a look at that piece of track under a strong magnifying glass. You will notice that the sandpaper left some minute scratches on the surface of the tracks. As your trains roll over the tracks dirt starts to accumelate in those scratches and you clean your tracks again with sandpaper creating more scratches and more dirt accumelates etc etc. ALWAYS use your track cleaning rubber. I have found the one made by Roco to be better than the Peco one as the Roco track cleaning block is made of a softer rubber compound. When you weather your tracks always use acrylic paints and for this I found a mixture of Tamiya brown and grey (to get the colour you want) acrylics to do the job just fine. Acrylics when dry are much easier to remove from the track surface than enamels.

I mostly use Peco points and before I airbrush weather the tracks I cut thin pieces of masking tape that I fold with the tacky side on the outsides. I then insert it between the two rails where it makes contact to mask it from the paint. When I paint I take care not to get paint on the contacts under the rails. If you are worried that you might get some paint overspray in places you do not want it, you can paint these sections with a brush.

Enjoy your hobby.

Regards from Pretoria in sunny South Africa.

Johan
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QUOTE (Makemineadouble @ 19 Oct 2006, 10:14) <{POST_SNAPBACK}>I use an Aztec double action airbrush. I switched after using a Badger for 15 odd years. I prefer the Aztec it's superior to use and much easier to clean. I do mainly use Acryllic paints, I use Windowlene to clean it.
I have several other airbrushes for course work, but for precision it's the Aztec for me.


Just recently joined the forum so here is my little contribution on the airbrush issue.

I think the selection of a quality airbrush from several manufacturers is a personal issue. When you use a quality airbrush, whichever make it is, and you are experienced in the use of the airbrush, you should get the same results. Each airbrush has its own do's and do not's just as the various DCC systems etc each has its own demands.

I use a double action Aztec with the metal body that I got as a present and must say that I am quite happy with the results as I am with the gravity feed. I also use a diaphram compressor. I have never experienced any problem with the cleaning of the gravity feed cups or the nozzles. I have also found that the solvents usually found in model paints do not attack the plastic nozzles and that includes laquer paint thinners. Keep in mind that Aztec airbrushes are used by artists customizing cars, trucks and motorbikes especially in America and for this purpose they use automotive paints. That does not mean that I am not prepared to try out or use a Badger or any other quality airbrush - in fact I would like to do it some day.

Most of the airbrushing I do is when I prepare a building or structure kit before assembly. Most of the times I use acrylics made by Tamiya, Vallejo, Revell and Games Workshop (paints used by the wargamers) and also enamels by Humbrol and Testors. Here in South Africa we really have to shop around for model paints. For the thinning of Tamiya, Humbrol and Testors I use the recommended solvents whilst for the Vallejo, Revell and Games Workshop I use clean water with a tiny drop of dishwashing liquid in it.

Enjoy the hobby!

Regards.

Johan
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Aztec are great, I recently bought my self a sand blaster as well, supposed to be good for removing decals and surfacing, as soon as I find a suitable application I'll post a report. It most certainly isn't going to be before my visit to the Republic. Bols & Coke here we come
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