Chloe Zhang
Painting plastic models is a fun hobby that requires some preparation and the right tools. Before you begin, it's important to decide which type of paint to use, such as enamel or acrylic. Enamel paint is an oil-based paint that requires a bit more skill and has a longer drying time than acrylic paint. It also requires special thinners for thinning and clean-up. When using enamel paint, it's important to consider ventilation due to its strong odour and potential fumes. Additionally, using tape to cover areas you want to keep paint-free and a model holder to keep your hands clean are essential steps in the painting process. With the right tools and techniques, you can create beautiful and detailed plastic models with enamel paint.
| Characteristics | Values |
|---|---|
| Skill level needed | Enamel paint is better suited to more advanced model painters |
| Solvent | Enamel paint is oil-based |
| Drying speed | Enamel paint takes longer to dry than acrylic paint |
| Toxicity | Enamel paint is more toxic than acrylic paint |
| Brush strokes | Brush strokes are more likely to show with enamel paint |
| Thinner | Enamel paint requires a special thinner |
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What You'll Learn
Enamel paint is not suitable for beginners
Enamel paint uses an oil-based solvent to absorb its pigment and cure on your plastic model car after application. If you want to thin your enamel paint for different application purposes, you will have to use something other than water. Water and oil do not mix, so be sure to use mineral spirits or another manufacturer-recommended paint thinner when spraying enamel paint for models. You will use the same paint thinner to clean your brushes and tools.
Enamel paint takes much longer than acrylic paint to fully dry. Oil-based enamel paints will require between 8-24 hours to dry completely due to their thickness. Water-based enamel paint can dry to the touch in 1-2 hours or less. Temperature and humidity have an effect on drying time, so outdoor projects can be expected to take longer to dry.
Enamel paints tend to make painting imperfections more visible due to their smooth, glossy consistency. For this reason, it is advisable to use a second "tip off" stroke after brushing on the top layer of paint. To do this, make sure the brush's bristles are wet with paint (but not oversaturated) and angle the brush as you make the second pass so that only the tips run along the area that you just painted.
Enamel paint is also more expensive than acrylic paint and emits more harmful fumes.
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Use a paint thinner to avoid brush strokes
Painting plastic models with enamel paint can be a rewarding endeavour, but it's important to know a few key techniques to achieve the best results. One common challenge when using enamel paint is avoiding brush strokes, which can be noticeable, especially on large, flat surfaces. Here are some instructive guidelines on using a paint thinner to minimise brush strokes when painting plastic models with enamel paint.
Firstly, it's essential to understand that enamel paint is oil-based. This means that enamel paint requires an oil-based solvent, such as mineral spirits or a manufacturer-recommended paint thinner, to thin the paint and modify its consistency for different application methods. Using a paint thinner with enamel paint is crucial because water and oil do not mix.
To avoid brush strokes, thinning your enamel paint with a suitable thinner is a recommended technique. By mixing the paint and thinner at a ratio of 2:1 (paint to thinner), you can achieve a smoother, more even finish. This ratio has been suggested by modellers to eliminate the brush stroke effect, although some brush marks may still be visible to some degree. It's important to use the corresponding thinner designed for your specific enamel paint to ensure compatibility and the best results.
When thinning your enamel paint, work in small sections and apply the paint quickly to the surface. This approach helps maintain a wet edge, allowing you to work on areas that have recently received paint and avoiding the paint from becoming tacky or starting to dry, which can lead to unsightly brush marks. Once the paint is on the model, use your brush to gently go over the painted area. Start by pulling your brush across the surface at an angle of approximately 45 degrees to the grain, and then lightly run your brush straight along the length of the section to smooth out any visible brush strokes.
Additionally, consider using additives specifically designed for oil-based paints, such as Penetrol, to further enhance the smoothing process. These additives help to slow down the drying time and thin the paint, providing extra time for the paint to level out and create a smooth, brush stroke-free finish. Remember, enamel paints naturally take longer to dry, so be patient and allow adequate time for the paint to cure and harden.
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Sand down the model before painting
Sanding down a model before painting is an important step in the painting process. It helps to smooth out any surface imperfections and creates a better surface for the paint to adhere to. Here is a step-by-step guide to sanding your model before painting:
- Identify the areas that need to be sanded: Look for any imperfections, such as putty, seam lines, or scratches, that need to be addressed. Unless you are removing seam lines or putty, sanding may not be necessary.
- Choose the right sandpaper: For plastic models, it is recommended to use high-grit sandpaper, ranging from 600 to 2000+ grit. The lower grit sandpaper (600-800) is better for removing base coat flaws, while the higher grit (1000-2000) is more suitable for removing finer scratches and surface blemishes.
- Wet the surface: Wet-sanding is generally recommended as it provides better results and prevents the sandpaper from becoming blocked. Spray water onto the surface or use a damp cloth to moisten the area before sanding.
- Sand the model: Start with the lower grit sandpaper and work your way up to the higher grit. Use random, erratic patterns with the sandpaper to avoid creating deep scratches or harsh lines. A sanding sponge or foam block can help you achieve better control and prevent the sandpaper from cutting too deeply into the plastic.
- Clean and polish: Once you have finished sanding, wipe the model with a damp cloth to remove any dust or residue. You can then polish the plastic with a clear gloss to enhance its shine.
By following these steps, you will effectively sand down your plastic model, creating a smooth and textured surface that is ready for the application of paint.
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Enamel paint is more durable than acrylic paint
On the other hand, acrylic paint is water-based and generally washes out in water. While it can provide a durable finish for plastic models, it is not as durable as enamel paint. Acrylic paint is easy to work with and dries quickly, but it may not be suitable for surfaces that require a tough, long-lasting finish. Acrylic paint is perfect for outdoor projects as it is flexible and can expand and contract with temperature changes without cracking. It is also UV-resistant, preventing colours from fading over time.
The durability of enamel paint makes it a popular choice for painting plastic models. It provides a smooth and glossy finish that is resistant to scratches and stains. However, it is important to note that enamel paint takes longer to dry compared to acrylic paint, and it requires careful preparation and technique. Enamel paint may also require a primer and multiple coats to achieve an even finish.
When painting plastic models with enamel paint, it is recommended to use a model holder to keep your hands clean and protect the model from fingerprints. Sanding the model with high-grit sandpaper before painting and between layers of paint is essential, especially when using a primer. Additionally, using painter's tape can help create sharp, straight lines without leaving a sticky residue.
Overall, enamel paint's durability, toughness, and resistance to staining and scratching make it a preferred choice for painting plastic models. It provides a long-lasting and polished finish, making it ideal for surfaces that require a hard-wearing and glossy appearance.
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Enamel paint is cheaper than acrylic paint
Enamel paint is often more expensive than acrylic paint. The higher cost of enamel paint is due to its durability and glossy finish, which are desirable characteristics for certain projects. Enamel paint is typically oil-based or solvent-based, resulting in a hard, glossy, and opaque finish that is resistant to wear and tear. This type of paint is ideal for surfaces that require a tough, long-lasting finish, such as metal, wood, and outdoor furniture.
On the other hand, acrylic paint is known for its affordability, making it a popular choice for artists, beginners, and those on a budget. It is easy to work with, dries quickly, and can be thinned easily by mixing with water. Acrylic paint is also available in a wide range of prices, allowing individuals with different budgets to find suitable options. The cost of acrylic paint can vary based on factors such as brand, quality, and quantity.
The difference in cost between enamel and acrylic paint is also reflected in their application methods. Enamel paint often requires more preparation and specialized techniques. It needs to be applied in thin layers and may require a primer or undercoat for optimal adhesion. Enamel paint also takes much longer to dry and cure, which can impact project timelines.
In contrast, acrylic paint is easy to use and clean up. It can be applied in thicker layers compared to enamel paint, and simple soap and water can be used for cleanup. Acrylic paint dries relatively quickly, allowing for faster layering and shorter project completion times.
While enamel paint may be more expensive, it is important to consider the specific requirements of your project. If durability and a glossy finish are essential, enamel paint may be a better investment despite the higher cost. On the other hand, if affordability, versatility, and ease of use are priorities, acrylic paint offers a more cost-effective option.
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Frequently asked questions
Enamel paint is an oil-based paint that provides better colour coverage and a smoother finish compared to acrylic paint. It is also more durable. However, enamel paint takes longer to dry, requires special thinners, and emits more harmful fumes.
You can use either a paintbrush or an airbrush to apply enamel paint. You will also need a paint thinner such as mineral spirits or a manufacturer-recommended thinner, and a model holder to keep your hands clean and protect the model from fingerprints.
Use high-grit sandpaper to sand down the model before painting and between layers of paint. You can also use tape to cover areas that you want to leave bare or paint a different colour.
Enamel paint can be thinned using a paint thinner such as mineral spirits or a manufacturer-recommended thinner. The thinning ratio will depend on the specific paint and thinner being used, but a common ratio is 2:1 paint to thinner.
