Airbrushing for Model Railroads


Airbrushing is a valuable tool for many applications in model railroading, including painting models and scenery – e.g., structures, bridges, model trains (locomotives and rail cars), tracks, trees, rocks, mountains, backdrops, ground cover, etc., etc), not to mention its benefits in many weathering projects as well. It provides a much smoother finish than regular brushing, and the results tend to be much more realistic and professional in appearance.


The single-action is the easiest of the two to use and clean, and it works very well for most model railroad work. There is one button to push to activate the airflow, which then pulls the paint out through the nozzle onto the surface of the model. The amount of paint that comes out can be adjusted by turning the paint nozzle, which houses the tip. The air and paint are mixed outside the airbrush as they flow toward the model.

Single action airbrush

The double action, on the other hand has one button that controls both the air flow and the amount of paint flow. If you push down on the button the air begins to flow, and if you pull the button backwards, the paint begins to flow. The amount of paint that comes out depends on how far back you pull the button. With this device, the paint and air are mixed inside the airbrush. Maneuvering the control on this airbrush takes more practice, but once you’ve mastered the technique, you have much more control over how the paint goes on.

Double action airbrush


To protect your lungs and sinuses, you should use a mask regardless of which device you are using.

Also, it’s a good idea to use a spray booth that is ventilated to the outside air. This is especially important if you’re using solvent-based paints. It keeps the paint particles from being dispersed all over the room, all over you, and all over your other models that you’ve already painted with another color.

You can buy pressurized cans of compressed air for short-term use, but if you do a fair amount of spray painting, this may get expensive. Therefore, investing in a small air compressor will probably save you money in the long run. The compressor should have an air regulator so that you can set a pressure of about 15-25 psi. Start with a lower psi and increase if you need to for more airflow.


Model paints

Solvent-based paints usually require less pressure than water-based acrylics.

Also, if you’re using acrylics, it’s generally a good idea to use the larger tip; acrylic paints tend to clog up the smaller tips.

Floquil is a solvent-based paint that should be diluted with Floquil Thinner 3:1 for use at a pressure of about 12 psi.

Polly Scale is water-based and should be diluted with either water or Polly Scale Thinner 3:1 used at a pressure of 15 to 25 psi.


Practice on a piece of old cardboard first. With the paint nozzle closed, press the button to just get the air flowing. Then slowly open the paint nozzle until the paint starts flowing. When you’re ready to start painting. Aim the nozzle to the side of the cardboard and push the button. After the paint begins to flow, then move the airbrush over the cardboard in a smooth horizontal line holding it about 3-6 inches away from the surface. Once the spray leaves the cardboard on the other side, then release the button. Continue to do this back and forth across the cardboard to get a nice smooth thin coverage. Once you’ve mastered the technique on the cardboard, you’re ready to move up to real models.

Remember to always start by painting a thin coat of paint over the model. If you try to put too heavy a coat on, the paint will run, pool, sag and dry unevenly.

It’s much better to apply 2 or 3 thin coats allowing for proper drying in between each coat.

Cleaning up

It’s very important to clean your airbrush after each use. Follow the directions that came with it for thorough and proper cleaning. Otherwise, you will find yourself with clogged nozzles and poor results the next time you try to use it.


You shouldn’t shy away from using this technique as many people do. It’s not that difficult to master and cleaning only takes a few minutes once you know how to do it. It’s a great tool to use for model railroading and a great craft to learn, in and of itself. And besides, it’s fun!

From "Airbrushing" to "Model Railroad Buildings"

From "Airbrushing" to "Weathering"

You might also like these pages:

  • Model Railroad DVDs

    Lots of great model railroad DVDs and Blue-Rays for watching your favorite train videos.

  • 3D Printing

    3D printing is a great way to create unique 3D models or parts for your miniature model railroad in any scale.

  • Model Railroad Buildings

    All about model railroad buildings – planning for them, kits, kitbashing, scratchbuilding, materials required, lighting your structures, interior details, how to install them onto your layout.

Back to Home Page


Contact Me | Blog | Photos | References | Supplies | GiftShop | Sitemap | Search | Comment | Privacy Statement | Disclosures

Train Logo for Building Your Model Railroad
BYMRR (Building Your Model Railroad) logo


√= ad or sponsored link

What's New on

Recent Articles

  1. MRC Model Railroad Digital Command Control System

    Jul 24, 21 05:35 AM

    MRC Digital Control System with the $78 price tag for my purchase. Will take $40. Email: Text: (713) 884-5248

    Read More

  2. Bachmann Model Railroad Command Control System

    Jul 24, 21 05:31 AM

    The system is pictured in the attached photos. The box is still wrapped in its original cellophane with the $92 purchase receipt attached. Will take $45.

    Read More

  3. Tinplate Model Railroad Books 5 piece set

    Jul 07, 21 05:49 AM

    FREE preview sampler, in PDF format for easy reading on pad or computer, can be delivered by internet. Send request and email address to

    Read More