How to Paint Plastic Models: Prep, Primer, Brush and Spray Methods

Prepare the plastic

Cut parts from the sprues cleanly, trim off leftover nubs and sand any rough spots or seams. Plastic from the factory can carry mold release agent, which is an oily residue that makes paint bead or peel. Wash parts in warm water with a drop of mild dish soap, rinse and let them dry fully, and then avoid touching the surface with bare fingers.

Decide what to paint before assembling. Some parts are easier to paint while still on the runner or as subassemblies, especially interiors and cockpits. Keep in mind where glue joins will go and avoid painting those areas, since paint under cement weakens the bond.

Test fit all the parts before you paint. It is much easier to find a gap, a warped piece or a seam that needs filling while the parts are bare than once they are painted. Fix problems first, then wash and dry the pieces, and then you can move on to primer with confidence that the surface will not need rework.

Read about filling and sanding seams →

Prime before you paint

Primer gives the paint something to grip and creates an even color base so top coats look uniform. It also shows flaws like scratches and seams you may have missed. A light gray primer is a versatile choice, white helps bright colors and black can deepen dark finishes. Apply thin, even coats rather than one heavy one.

Let the primer cure as directed before painting. Check that the primer and paint types are compatible, and test on a spare part if unsure. Our article on priming models covers why it matters and how to do it right, and our primer guide compares products.

Compare model primers →

Choose your method

Brushes are the most accessible. They need little equipment, work well on small parts and details, and suit acrylic paints. The challenge is avoiding brush marks, which thin coats and quality brushes help prevent. Spray cans give a smooth finish over large areas, such as car bodies, but offer less control and need ventilation.

An airbrush gives the finest control and thinnest coats, but needs a compressor, cleaning and practice. Many builders use a mix: spray cans or airbrush for large areas and brushes for details. There is no single right way, so choose what fits your budget, space and the finish you want.

Space and ventilation can also decide the method. Spray cans and airbrushes release fine mist, so they need good airflow and a respirator, and they can be impractical in a small shared room. Brush painting is quiet, has a minimal footprint and can be done at a kitchen table, which makes it a practical way to start. You can always add spray gear later.

Compare brush painting and airbrushing →

Paint in thin coats

Whatever the method, thin coats win. Several light layers dry evenly and keep detail sharp, while one thick coat can pool in recesses, hide detail and run. With a brush, thin the paint slightly if the label allows and load only a little on the bristles. With spray, keep the can or airbrush moving and a steady distance from the part.

Let each coat dry before applying the next. Rushing leads to fingerprints, smears and lifting. Light colors like yellow and red often need more coats, especially over dark primer, so a white or light primer can help. Keep a spare part handy to test colors before committing to the model.

Keep your brushes clean and in good shape. Dried paint at the base of the bristles makes a brush splay and leaves streaks, so rinse often while you work and clean thoroughly at the end of each session. A good brush well cared for lasts a long time and makes a noticeable difference to how smooth the paint goes on.

Compare model paint sets →

Masking and detail painting

For multi-color paint jobs, mask areas with hobby masking tape and let the base color cure before taping. Press the edge down firmly and remove the tape slowly at an angle to reduce peeling. Our article on preventing peeling can help if paint lifts with the tape.

Detail painting comes last on most builds: use a fine brush and small amounts of paint, steady your hand against the bench and work in good light. A magnifier or head visor helps with tiny parts, and thinner paint flows more smoothly into small details.

Read how to prevent paint peeling →

Seal and protect

After the paint cures, apply a clear coat to protect it from handling. Gloss helps decals settle, while matte or satin gives a realistic finish. Test the clear coat on a spare part first, because some solvents react with certain paints.

Spray in a ventilated area, wear a respirator suited to the product and follow the safety information on every can and bottle. Keep the finished model away from dust and sunlight, and handle it by the base or sturdy parts.

Compare model clear coats →

Frequently asked questions

Do I have to prime plastic models? It is strongly recommended, because primer helps paint stick and evens out the surface. Can I paint without sanding? You can, but smoothing seams and nubs first gives much better results.

Which paint is best? Acrylics suit beginners, while enamels or lacquers suit other tasks. Test on a spare part before you commit. How long should paint dry? Follow the product label, and allow extra time in cool or humid rooms.