Marcus Chen
Painting the outside of a Lexan body is a common practice, but it requires careful preparation and the right type of paint to avoid chipping and scratching. The protective peel coat on the outside of a Lexan body must be removed before painting, and the body must be thoroughly washed and dried to ensure paint adhesion. While some sources suggest using R/C paints designed for Lexan, others recommend specific brands like Krylon Fusion, Krylon Ultra Flat, and Tamiya. Painting the inside of the Lexan body first can add a unique effect when the outside paint scratches, revealing the inner colour.
| Characteristics | Values |
|---|---|
| Paint type | Lexan-based paint, such as Parma Faskolor, Tamiya PS paint, Krylon ultra flat black, Pactra |
| Paint application | Spray, brush, airbrush |
| Paint adhesion | Light scuffing with fine Scotch Brite, sanding, or scuffing before painting improves adhesion |
| Paint layering | Paint the inside silver or copper for a rust effect, then paint the outside grey or white, or body color |
| Paint protection | Use a gloss clear coat to protect the paint job and improve decal adhesion |
| Paint removal | Use brake fluid to remove old paint, but avoid paint strippers that will destroy Lexan |
| Paint alternatives | Use automotive pin-striping tape or decals for customization |
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What You'll Learn
Paint layering techniques
Painting the outside of a Lexan body can be a delicate process as the paint can scratch or chip off. However, there are several layering techniques that can be used to achieve the desired effect.
Firstly, it is important to prepare the Lexan body for painting. This includes removing any protective coating or peel coat from the body, as well as thoroughly washing the body with dish soap and water to remove any grease or oil. The body should then be dried completely with a soft, lint-free cloth. It is also recommended to use a light scuffing technique with fine Scotch-Brite on both the outside and inside of the body to improve paint adhesion.
Once the body is prepared, the painting process can begin. One popular technique is to layer different colours to create a unique effect. For example, painting the inside of the Lexan body with a base coat of silver or copper to simulate metal, followed by a layer of rust-coloured paint, and finally the desired body colour. This creates a patina effect, and as the outer layers of paint scratch off, the metal and rust colours will be revealed, giving the appearance of aged metal. To enhance this effect, some people sprinkle water and coarse salt on the paint layers.
Another technique is to use a clear Lexan shell and paint the inside with a chosen colour. When the painted shell scratches against something, it will reveal the colour underneath, creating a unique worn look. This technique is particularly popular for rock crawlers as it shows tough use and adds character to the model.
When painting Lexan bodies, it is recommended to use paints specifically designed for Lexan, such as Parma Fascolor or Tamiya PS paint. These paints are formulated to work well on the material and can be found in various colours, including rust and silver. After applying the base coat, some people choose to add a layer of gloss clear coat to enhance the shine and improve the adhesion of decals. However, it is important to note that some paints, like lacquer, may react with certain base coats, so it is advisable to test a small area first.
Finally, it is important to allow each layer of paint to dry thoroughly before applying the next coat. Using a hairdryer to flash dry each layer can speed up the process. Additionally, masking tape or automotive pin-striping tape can be used to create custom designs and protect certain areas from paint overspray.
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Paint type and colour
Painting the outside of a Lexan body is a common practice, but it requires careful consideration of paint type and colour to achieve the desired results.
When it comes to paint type, it is essential to choose a paint specifically designed for Lexan or polycarbonate surfaces. Regular paints, such as acrylic, will not adhere well to Lexan and may crack and peel over time due to the flexibility of the surface. Paints formulated for Lexan, such as those from brands like Tamiya, Parma Fascolor, Pactra, and Vallejo, are designed to flex with the material and provide a durable finish. These paints are available in various colours, including flat colours like olive drab, brown, and black, as well as metallic shades like silver and copper.
Some enthusiasts recommend using a clear poly paint or a clear coat as a base before applying other paints. This can improve adhesion and allow for greater flexibility in the choice of topcoat colours. For example, one individual suggested using a basic PS colour as a base coat, followed by TS paints or even normal rattle cans as the topcoat. A clear coat can also be applied over the final colour to add gloss and protect the paint job.
When choosing colours, it is important to consider the desired effect. For a rock rash or weathered look, some people paint the inside of the Lexan body with silver or copper to simulate metal, and then apply a body colour over it. As the outer paint chips or scratches away, the metallic colour underneath is revealed, creating a unique and rugged appearance. This technique can be enhanced by sprinkling water and coarse salt on the paint to create a patina effect.
It is worth noting that painting the outside of a Lexan body may result in a more matte or dull finish compared to painting the inside. Additionally, the paint may chip or scratch off over time, which can be desirable for certain effects but may be undesirable for others. Therefore, it is crucial to plan the paint job carefully and choose the appropriate paints and techniques to achieve the intended results.
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Paint adhesion
Painting the outside of a Lexan body can be a tricky process due to the material's unique properties. Lexan, also known as polycarbonate, requires specific types of paint and preparation methods to ensure proper paint adhesion. Here are some key considerations and steps to achieve better paint adhesion on Lexan surfaces:
Choose the Right Paint:
Lexan requires the use of paints specifically designed for polycarbonate surfaces. Regular automotive paints or acrylic paints are not suitable as they lack the necessary flexibility and will likely crack and peel over time. Look for paints labelled as "Lexan/polycarbonate paint" or "polycarb-specific paint". Brands like Tamiya offer a range of colours in their PS series, and Pro-Line has an airbrush-able line of polycarbonate paint.
Prepare the Surface:
Before painting, it's crucial to prepare the Lexan surface to enhance paint adhesion. Clean the surface with a wax and grease remover and allow it to dry thoroughly. You can also scuff the surface lightly with fine Scotch-Brite pads to create a better adhesion surface. This step is especially important if you want to paint the outside of the Lexan body, as it will help the paint adhere properly and reduce the chances of chipping or flaking.
Use a Primer or Adhesion Promoter:
Applying a plastic adhesion promoter or a suitable primer can significantly improve paint adhesion on Lexan. After cleaning and scuffing the surface, apply two coats of a plastic adhesion promoter or a polycarbonate-specific primer. This step will provide a better bond for the paint to adhere to and reduce the likelihood of paint failure.
Apply the Paint:
Once the surface is prepared and primed, you can apply the Lexan/polycarbonate paint of your choice. Follow the manufacturer's instructions for thinning and application methods, as these can vary depending on the paint system you choose. It's important to note that multiple thin coats are generally better than a single thick coat to achieve a durable and aesthetically pleasing finish.
Consider a Clear Coat:
After applying the base colour, consider using a clear coat to protect the paint and enhance its adhesion. A gloss clear coat, for example, can improve the adhesion of decals and give your project a professional finish. You can choose a clear coat that is specifically designed for Lexan, or a regular clear coat if you're satisfied with the level of protection it offers.
Avoid High-Impact Areas:
If you're painting a Lexan RC car body or a similar application, avoid painting high-impact areas that flex frequently. These areas are more prone to chipping, flaking, and cracking, which can lead to paint failure. Consider using alternative protection methods, such as a flex seal, drywall tape, or shoe goo in these high-impact zones.
By following these steps and choosing the right materials, you can achieve better paint adhesion on the outside of a Lexan body. Remember to take your time, work in a well-ventilated area, and always follow the manufacturer's instructions for the specific products you're using.
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Paint removal
Painting the outside of a Lexan body is a common practice, but sometimes you may need to remove the paint. Here are some methods to safely strip the paint from a Lexan body:
Brake Fluid
Brake fluid can be an effective way to remove paint from Lexan. Apply it with a small paintbrush and scrub away the paint. This method is inexpensive and won't cloud the Lexan, but it requires some effort and time. Ensure you keep the scrubbing away from any windows or areas you want to remain clear, as you may scratch the Lexan.
Ronsonal Lighter Fluid
Ronsonal lighter fluid will not harm Lexan and might be effective in softening the paint enough for removal.
Mineral Turpentine
Mineral turpentine is recommended by some as a means to remove paint from Lexan. It is suggested that this method will effectively remove the paint without damaging the Lexan.
Nitro Fuel
Nitro fuel can remove paint from Lexan, but caution must be exercised. Nitro fuel can harm the Lexan if used repeatedly or left on for too long.
Trinity Body Blast
Trinity Body Blast is a product specifically designed to remove paint from Lexan. It can effectively remove overspray and even servo tape residue.
Non-Acetone Nail Polish Remover and Denatured Alcohol
A mixture of non-acetone nail polish remover and denatured alcohol is recommended by some as an effective paint removal method. The suggested ratio is 2 parts nail polish remover to 1 part alcohol. This method may leave the Lexan body brittle and semi-cloudy.
Bolink R/C Body Wash
Bolink R/C Body Wash is a product designed to clean paint off Lexan bodies. It is safe to use and will not damage the Lexan.
Lacquer Thinner and Rubbing Alcohol
A mixture of lacquer thinner and rubbing alcohol in a 1:1 ratio is said to effectively remove paint without harming the Lexan.
RC Gas Car Fuel
RC gas car fuel can be used to remove paint from Lexan without causing any damage.
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Paint application methods
Painting the outside of a Lexan body is a common practice, but it requires careful preparation and the right choice of paint to avoid chipping and scratching. Here are some detailed instructions for paint application methods:
Paint Types and Application:
- It is recommended to use paints specifically designed for Lexan or polycarbonate surfaces, such as Tamiya PS paint or Parma Faskolor. These paints are formulated to adhere well to the Lexan material and can be found in various colours, including olive drab, brown, and flat black.
- Lacquer-based paints, such as Pactra, can also be used but require thinning to avoid cobwebbing when spraying. Always follow the manufacturer's instructions for thinning and application.
- Water-based paints, such as Faskolor by Parma, are another option. These paints typically require brushing or spraying and offer the benefit of easy water cleanup.
- For a unique effect, some people use copper or silver paint on the inside of the Lexan body to simulate rust when the outer paint layer scratches away.
Surface Preparation:
- Before painting, it is crucial to remove any protective coating or peel coat on the Lexan body. This coating protects the surface from scratches and paint overspray during manufacturing and shipping.
- Clean the Lexan surface thoroughly with dish soap and water to remove any grease, oil, or fingerprints that may prevent the paint from adhering properly.
- If desired, you can cut around the windows or use masking tape to create a mask for the areas you don't want to paint.
Painting Techniques:
- Apply the paint in several light coats to prevent runs and excessive paint buildup. This is especially important when using spray paints.
- If using an airbrush, consider using a filter to prevent any water or oil from spraying onto the surface.
- Allow each coat of paint to flash dry with a hair dryer between applications.
- If using a lacquer-based paint like Pactra, be cautious when applying a top coat as there is a chance it could react with the lacquer and blister. Apply top coats very lightly to minimise this risk.
- For better adhesion, scuff the Lexan surface lightly with fine Scotch-Brite before painting.
Clear Coats and Decals:
- After painting, you can apply a gloss clear coat over the dull paint to enhance the appearance and improve decal adhesion. This step is optional and does not require a Lexan-safe product.
- Test the position of decals before applying them, as they cannot be removed without damage once adhered. Use window cleaner to allow for repositioning if needed.
- If air bubbles form under the decals, puncture them with a sharp pin and gently push out the air.
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Frequently asked questions
Yes, you can paint the outside of a Lexan body. However, it is more common to paint the inside of the body as the outside has a removable peel coat to protect it from scratches and paint overspray.
It is recommended to use R/C paints designed to adhere to Lexan. Home depot spray paint will crack and chip easily. Krylon ultra-flat paint is a good option as it adheres well to Lexan and is difficult to scratch off. Tamiya also makes a Lexan paint in a rust colour.
To prepare the outside of a Lexan body for painting, you must first remove any protective coating. Then, you should wash the body thoroughly with dish soap and water to remove any grease or oil. Dry the body completely with a soft, lint-free cloth. If you want to mask off any areas, use special tape made for striping or automotive pin-striping tape.
Yes, you can paint the outside of a Lexan body with normal spray paint. However, it will be more susceptible to scratches and damage. It is important to prep the surface by sanding or scuffing it so that the paint sticks.
