Clean and dry the model. Use soap and water and a rag to clean the model. Clean off all dust and fingerprints. Put model in a dust free area to dry.
After the model dries, start with a primer coat in white enamel. Use a broad flat brush to paint even strokes on the model. Oil paint flows on smoothly, so use the nice flow to make the bottom coat even. Do not overlap any strokes. Let the first coat dry for two days. Sand evenly, and paint another primer coat. Let dry. Repeat until the coat is solid and even.
After the primer dries for 48 hours to cure, paint layers of base coats in the color. Thin the paint with 1 part thinner for 3 parts paint. Using a flat brush, paint on a coat using light, solid strokes that take advtange of the easy flow of enamel. Paint each colored area. Let dry for two days. Keep painting coats until the model has solid colors. Wait at least 48 hours before starting the thin coats.
Paint layers of thin body coats. Mix the paint into a gloss paint by thinining with 1 part thinner for 2 parts paint. Enamel takes on a brilliant appearance when you use at least five thin layers. Let dry.
Once the main areas and parts have dried hard, add details and lines. A fine point brush gives you fine lines and small detailed strokes. Wipe off excess paint from the brush sides and line the paint on a paper until you see the enamel's fine line. Then, use the tip to paint nice details and fine lines.
Use a thin clear coat to give the body coats a fine surface with good light reflection. Enamel also captures light much better than acrylic. Apply a cover coat in clear enamel. Let the coat dry smooth and reflective.
If you want a realistic look, use a wash in dark brown or black. Make a wash by mixing 1 part dark brown or black with 5 parts thinner. Coat the entire model, letting the wash settle in crevices, inset lines ad nooks. The darker color makes the car, truck or plane look like its been used in real weather. Let dry.
Dry brush the paint surface. For the dry brushing, do not wet the brush or add thinner to the paint. Use a tiny amount of paint in white mixed with a little of the base color. With the brush tip, use light quick stokes to highlight areas. Let each layer dry for two to five hours. Build the dry brushed layers until highlights become clear. After the last coat has cured for two days, buff with a rag.
Finish with a cover coat. Give the model a brilliant finish by coating the entire surface with a fine coat of matter finish.