Spray Painting Your Model Car
Attach your model to a wire coat hanger. Pull on the middle of a wire coat hanger so that it looks like a diamond. Continue to flatten out both sides so that they run vertically. Once your done doing that, bend the hanger over itself to create a stand that your car model can hang on while you work on it. The hanger should look like the letter C. Attach the end of the hanger to the inside of your model using a strong masking tape. Once you're done taping your model to your stand, test its stability by pressing your fingers on the front and back of the model. Attaching your model to a hanger will allow you to spray paint the entirety of the car, including the bottom and interior.
Spray a layer of protective primer over your car's model. Purchase a model-specific primer or a general primer to lay an opaque base coat for your model. You can purchase a protective primer at most arts and crafts stores. Apply pressure to the trigger of the primer and try to get an even coat across the surface and interior of the model. Once you're done, remove the tape and spray primer in the areas that were covered up by the tape. Keep your model in a well-aerated area while it dries. If you are using a primer specifically made for model building, you don't need to apply a base primer, though it could add to the overall consistency of your paint job. Use a gray or off-white primer for your model car. Primer will also act as an adhesive for other layers of paint. A layer of primer is necessary if you want to use real automotive paint because it contains solvents that are harmful to the plastic model. The primer will take anywhere from two to four hours to dry.
Sand the model with a fine grit sandpaper. Take the model off of the stand and use a 1200-1500 sandpaper to smooth out the car's surfaces. When sanding, make sure not to sand off the protective primer that you applied. If you notice that you do, go back to the area and spot paint with your spray can. The goal is to get your model smooth and ready for painting.
Wash your car. Wash your car with a damp rag and a drop of mild dish soap. There will probably be primer residue left over from sanding that you should remove. If there is dust on the surface of your car before you paint it, it will be trapped in the paint job. Pat your car dry once you're done.
Apply your coats of paint. Reattach the car to your painting stand and shake your spray paint can. Point the spray paint can on your car and administer pressure to the trigger while slowly sweeping the can horizontally to apply even coats of paint across the surface of your car. Once you're done, allow the paint to dry overnight before applying another coat of paint. Continue to do this until the color reaches the deepness and richness that you desire. Before you paint your model, it's smart to practice using the spray can on a piece of newspaper. Spray can handles are add-on mechanisms that you can add to any can to make it easier to spray. Enamel paint dries slowly and hardens to a shiny finish. Acrylic paint dries quickly and is easier to clean up.
Sand and wash your car. Once you've painted your car to the desired hue, you'll most likely want to remove the bumps and imperfections in the dried paint. Sand the surface of your car with a very fine 3600 grit sandpaper. Once the surface of the car looks smooth and even, wash the car with cold water and a drop of mild dish soap.
Hand Painting the Car
Add paint thinner and stir your paint. There are paint thinners that have been created specifically for model use. If you are using a specific brand of paint, use the same brand of paint thinner. If you can't find paint thinner or want to create your own, combine 50% distilled water with 50% of propyl alcohol and your paint in a 1:1 ratio. Thinning out the paint lightens the consistency and enables you to make more consistent coats.
Wash your model car. Use a mild dish soap and cold water with a rag to wash off your car. Remove any particles of dust that may have built up on the surface of the car as a result of sanding. Wipe the model dry before moving onto the next step.
Paint the smaller pieces of your model first. Dip your brush into your paint and fill in the more intricate pieces of your model, like the mirrors first. Make sure not to paint over areas where your model will fit together, or you may have trouble assembling your model correctly. Get a variety of different sized brushes to make painting easier. You can use either a synthetic or natural-haired brush to paint your car models.
Apply paints using even, consistent strokes. Continue to paint over larger parts of the car. Do not dab or scrape with the brush unless you are doing specific detailing. Instead, you want to achieve an even coat by making long and even strokes. Popular paints for model cars include Testors, Model Masters, Humbrol, Tamiya, PollyScale, Floquil, and Vallejo.
Allow your model car parts to dry before applying additional coats. Allow your model car to dry overnight before going back to apply additional coats to the model. Continue to work at painting your car, applying the paint as evenly across the model as possible. Apply painter's tape to finished details so that you don't ruin them when applying additional coats of paint.
Air Brushing the Car
Practice airbrushing on a separate piece of plastic. Read the user's manual for the airbrush that you are using. Once you've correctly hooked up your air brush, practice at different pressure levels to get a feeling for how the airbrush works. Use a cheap paint and airbrush on large pieces of butcher paper. Airbrushes typically cost anywhere from $25 to $300 and up. Remember to wear a protective mask and to lay out a tarp on your work area when using an airbrush.
Wash your model car. Use a mild dish detergent and cold water to wash the surface of your car. This should remove molding agents which could react poorly with your paint. Once your car is free of dirt and dust, allow it to air dry before airbrushing it.
Tape off special designs and decals. Because an airbrush paints a large area at a time, it's important that you tape off decals or designs that you want to paint in later. Once you've achieved the car has dried, you can remove the painter's tape and fill in finer details with a more precise tool like a brush.
Set your model car on a wire hanger. In order to quickly airbrush your car, it will need to be suspended in the air. Use a bent wire hanger as a base and stand for your model car, attaching the stand to the car from the inside. As an alternative, you can also find a stable and flat pillar to set your car on top of as you paint. Make sure to attach the car to the stand using masking tape.
Use a gray or off-white primer for your model car.
Allow primer to completely dry before proceeding to the next step.
Apply an airbrushed coat of paint onto your car. Connect the paint jar color that you want to use to your airbrush. Apply the first base coat with your airbrush by applying pressure to the actuator, or button on the top of the airbrush. Quickly move your hand left to right and apply mist coats at 25-30 PSI. Continue to rotate your model car as you apply more coats of paint. When you are nearing the end, lower the PSI on your airbrush to 18-20 PSI to apply the final one or two coats. Lowering the airbrush PSI will make the paint come out thicker. Do not let the thick paint run, or it may ruin your model. Be conservative on thick coats of paint. Remember to airbrush separate parts of your car, such as the hood, as you paint the car's body.
Allow the paint to dry. Dry your car model for 24-48 hours before handling it. Keep the car in a cool area free of sunlight while it dries. Once it's totally dried, examine the car and look for areas that are not painted. Instead of airbrushing over the car again, fix small details with a brush and matching paint.
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