Alexei Volkov
Painting plastic can be a great way to give new life to worn-down items, but it's important to take the right steps to ensure the paint job lasts. Plastic is a challenging surface to paint due to its smooth texture, and it's prone to cracking or flaking over time as it expands and contracts with temperature changes. To achieve a long-lasting paint finish on plastic, it's essential to prepare the surface properly, use the right type of paint, and follow specific application techniques. In this guide, we'll cover everything you need to know about painting plastic, from choosing the right paint and primer to surface preparation and painting tips, so you can achieve a professional-looking and durable result.
| Characteristics | Values |
|---|---|
| Surface preparation | Clean the surface with a scrub brush, then use soapy water to remove dirt. |
| For outdoor items, use a stronger cleaner to remove mildew or algae. | |
| Use sandpaper to scuff and roughen the surface, making it easier for paint to adhere. | |
| Remove sanding dust with a dry cloth and a wet rag. | |
| Priming | Use a plastic-specific primer or an adhesion promoter to ensure paint adhesion. |
| Apply the primer in thin, even coats using a spray or a brush. | |
| Painting | Use a paint specifically formulated for plastics. |
| Apply the paint in thin, even coats, following the direction of the primer coats. | |
| Allow sufficient drying time before applying a second colour or removing tape. | |
| Consider using a clear coat for added protection, especially for outdoor items. |
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What You'll Learn
Clean the surface with a scrub brush and soapy water
Painting plastic can be tricky, but with the right approach, you can transform old or faded items. The key to success is choosing the right paint, prepping the surface properly, and applying it with care to ensure a finish that lasts.
Before painting plastic, it is important to clean the surface with a scrub brush and soapy water. Here are some detailed steps to guide you through the process:
- Fill a bucket or container with warm water and add a mild dish soap or liquid soap to create a soapy solution. Avoid using harsh cleaners as they may damage the plastic.
- Use a scrub brush, sponge, or clean rag to scrub the plastic surface thoroughly. If the item has been painted before, start by scrubbing it dry to remove any loose or flaking paint.
- Scrub the surface with the soapy solution to remove dirt, grease, or other debris. Pay extra attention to textured areas and rinse thoroughly with cool, clean water to ensure no suds remain. You may need to repeat this process multiple times, especially for items that have been outdoors and may have mildew or algae.
- Once the surface is clean, rinse it again with cool, clean water to remove any soap residue. Ensure the plastic item is completely dry before moving on to the next step.
By properly cleaning and preparing the plastic surface, you will ensure that the paint adheres well and achieves a smooth and durable finish. Remember to choose the right type of paint and apply it carefully for the best results.
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Sand the item with fine-grit sandpaper to scuff the surface
Sanding is an important step in preparing plastic for painting, and using fine-grit sandpaper is ideal for creating a slightly rough surface without causing visible scratches. Begin by wearing protective gear, such as gloves and a face mask, to avoid any direct contact with plastic dust. Choose a suitable grit size for the sandpaper; for most plastics, a fine-grit sandpaper between 220 and 400 grit will be effective. If the plastic surface is particularly smooth or glossy, you may need to start with a slightly coarser grit, such as 180, and then progress to a finer grit for the final passes. Ensure the plastic surface is clean and dry before you start sanding.
Wrap the sandpaper around a sanding block or a flat, soft surface to ensure even pressure during sanding. Start sanding the item gently, using a consistent, light pressure and following the direction of the grain or any existing lines on the plastic surface. Sand the entire item, focusing on areas that will be painted. Take your time and avoid applying too much pressure, which could cause the sandpaper to cut through the plastic or create uneven scratches. It is important to maintain an even, consistent finish.
Frequently check your progress by wiping the surface with a damp cloth or using a vacuum to remove the sanding dust. This will allow you to inspect the evenness of the scuffed surface and ensure you are not removing too much material. Continue sanding until the entire surface has a uniform, slightly dull appearance. Pay extra attention to corners, curves, and intricate details, as these areas can be challenging to sand evenly. Use smaller pieces of sandpaper or a foam sanding block to navigate tight spaces and maintain consistent pressure.
Once you have finished sanding, remove all sanding dust from the item's surface. You can use a tack cloth, a damp cloth, or a soft brush to ensure all residual dust is eliminated. After sanding, the plastic surface should have a slightly scuffed or matte appearance, indicating that the surface has been adequately prepared for painting. This process ensures that the paint will adhere properly to the plastic, resulting in a more durable and aesthetically pleasing finish. After sanding, you can proceed to the next steps, which typically involve cleaning, priming, and then painting the item with your desired colour and finish.
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Use a plastic-specific primer to aid paint adhesion
Painting plastic can be a quick project with long-lasting results. It is important to note that most plastic is glossy, so sanding is an essential step to ensure the paint adheres well. You can use 180- to 220-grit sandpaper to lightly sand all surfaces. This will create a rougher, matte surface for the paint to stick to. If you are working with a larger plastic surface, you may want to use a random orbital sander. However, be careful not to vigorously sand the plastic as this may create enough friction to melt it.
After sanding, it is crucial to clean the plastic surface with a scrub brush to remove any remaining dust or dirt. Using a dry brush first will help to remove any loose or flaking paint, and going over it again with soapy water will ensure that any dirt or mildew is removed. Once the surface is clean, you can begin preparing the plastic primer.
Plastic primer, also known as an adhesion promoter, is specifically designed to treat bare plastic and increase the adhesion of the paint. It provides a base layer that facilitates the adhesion of the paint and enhances its durability. When choosing a plastic primer, it is important to identify the type of plastic you are working with to ensure compatibility. For example, primers like Roberlo's MULTYFILLER GRIP are designed for direct adhesion to ABS, PP-EPDM, and PP-PE-EPDM plastics.
Once you have selected the appropriate plastic primer, it is important to follow the manufacturer's instructions for application. In general, you will want to apply thin, even coats of primer to the surface, maintaining an application distance of about 20 cm. Allow the primer to fully dry according to the product's specifications before proceeding to the next step.
By using a plastic-specific primer, you can optimize the anchoring of the subsequent paint coats and ensure a high-quality, long-lasting finish.
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Use spray paint or hand paint for intricate details
Painting plastic D&D miniatures is a great way to make your game more immersive and special. It can be time-consuming, but the process is rewarding and fun. Here are some tips for using spray paint or hand paint to achieve intricate details:
Preparation
Before painting, clean your miniature with warm water and dish soap to ensure no dust particles or contaminants get sealed into your paint job. You can also use isopropyl alcohol for this step. If your model comes in multiple parts, you will need to assemble it first. Use a small file to smooth out any rough bits, then clip the model from the sprue and scrape off any mould lines with the back of a craft knife. For non-push-fit models, use poly cement or super glue to glue the pieces together.
Priming
Primer helps the paint adhere to your miniature and creates a uniform colour, but it can fill in intricate details and make your model thicker. If your model is made of plastic only and you don't plan on handling it regularly, you can skip the primer. Otherwise, use a white, grey, or black spray primer, holding the can 10-12 inches (25-30 cm) away from the model and spraying in quick, even strokes. Leave the model to dry for at least 30 minutes to 24 hours.
Basecoating
The basecoat will be the first layer of paint on your miniature. Choose the colours that will make up the major parts of your figure, like skin, clothes, and hair. You can use spray paint or a small brush to apply the basecoat. Start with the most prevalent colour and work from your largest coats of paint down to the smallest details. Take your time and work slowly, using overlapping brushstrokes to ensure a beautiful finish. When spray painting, use quick bursts of colour to apply coats evenly. Remember to thin your paint with water if necessary to avoid painting over small details.
Shading and Layering
Add shade to the recesses of the model to imply shadows, then clean up any areas where shade is not needed. You can then add layers of paint to create depth and bring back vibrancy to your model. Techniques such as dry brushing can help bring out the topmost details on your figure. Simply dab some paint on a dry paintbrush, wipe most of it off, and lightly brush over the details you want to emphasise.
Final Touches
To protect your paint job and finalise the look of your miniature, add a clear coat varnish, especially if you plan on handling it regularly. You can use a spray can or a bottle, depending on your preference. Anti-shine matt varnish is a good option to protect the paint while adding a nice finish.
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Allow the paint to dry before removing tape
Allowing the paint to dry before removing the tape is crucial for achieving a clean and professional-looking finish. The paint should be dry to the touch, which typically occurs within an hour or two, but it's always best to check the manufacturer's recommended drying times. This waiting period ensures that the paint won't smear or smudge when you start removing the tape.
If you're working on a project that requires multiple coats of paint, the tape-removal process can vary. Some prefer to remove the tape after the final coat is applied, while the paint is still tacky and not fully dried. This helps prevent the paint from bonding with the tape, reducing the risk of peeling. However, others opt to leave the tape on until the last coat is dry to the touch, ensuring that the paint won't tear or create uneven lines during tape removal.
If you choose to remove the tape between coats, it's essential to wait until the previous coat is dry, usually about 24 hours, before proceeding. Additionally, consider using painter's tape with very low tack or adhesive for delicate surfaces when applying the next coat. This will help you achieve a clean removal without damaging the underlying paint job.
The type of painter's tape you use also matters. Each brand has instructions on how long the tape can remain in place, and some tapes are designed to be left on for longer periods. Blue painter's tape, for example, allows for a 21-day clean removal. Choosing the right tape and following the manufacturer's instructions will help ensure a successful outcome.
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Frequently asked questions
Spray paint is the best option for painting plastic as it delivers a smooth and long-lasting finish. It is also easy to apply and requires less prep work. However, it is important to prep your area before spray painting, especially as spray painting is best done outside due to the fumes and overspray. Cover the ground with cardboard, a tarp, or a large piece of cardboard to protect your patio or lawn.
It is important to use a paint that is specifically formulated for use on plastics. Some of the most popular choices include Krylon Fusion, Rust-Oleum Universal, and Rust-Oleum Painter’s Touch 2X Ultra Cover. These paints include a primer, but it is still a good idea to use a plastic-specific primer first for better adhesion.
First, clean the surface of the plastic with a scrub brush. If the item has been painted before, use a dry brush first to remove any loose or flaking paint, then go over it again with soapy water to remove any remaining dirt. If the item is outdoor furniture, you may need to put in some extra effort to remove any mildew or algae. Once the surface is clean, use fine-grit sandpaper to roughen the smooth surface of the plastic, giving the paint something to stick to. Finally, remove the sanding dust with a dry cloth and a wet rag with mineral spirits or isopropyl alcohol.
To ensure that your paint job lasts, it is important to take your time and not rush the process. Allow the paint to dry completely before removing any painter's tape or reattaching any hardware. You can also use a clear, non-yellowing spray to give your finished product an added layer of protection, especially if it will be exposed to the elements.
