Alexei Volkov
Painting plastic can be a simple process to refresh dated or dull items and make them stand out with colour. However, the paint tends to drip, pool, and blotch; once dried, it quickly peels off. To avoid this, it is important to use the right paint system and prepare the surface before painting. This includes using a primer to optimise the anchoring and adhesion of the paint. The main benefit of multi-surface paints is that they self-prime, but if you are using a regular spray paint, then you will want to prime the plastic first.
| Characteristics | Values |
|---|---|
| Paint and primer work on plastic | Yes |
| Types of paint | Spray paint, brush paint |
| Types of primer | Spray primer, paint brush primer |
| Paint brands | Krylon Fusion for Plastic, Rust-Oleum Specialty Plastic Primer Spray |
| Primer brands | Tamiya |
| Paint and primer suitability | Depends on the type of plastic |
| Surface preparation | Clean, dry, dust-free, degrease, remove loose materials |
| Surface preparation tools | Scraper, stiff-bristle brush, detergent, sugar soap, air gun, sandpaper |
| Primer application | Thin, even coats, one direction, zig-zag pattern |
| Primer drying time | As per can directions |
| Paint application | Thin, light coats, one coat at a time |
| Paint drying time | As per paint directions |
| Paint curing time | Several days |
| Paint finish | Smooth, buff with sandpaper |
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What You'll Learn
Spray paint is better than brush paint
Painting plastic can be tricky as the paint tends to drip, pool, and blotch, and then quickly peels off. However, it is possible to paint plastic with the right tools and preparation. Spray paints designed for use on plastic can go on smoother, stick better, and resist peeling. For example, you could use a spray paint labelled as being specifically meant for plastics, like Krylon Fusion for Plastic or Rust-Oleum Specialty Plastic Primer Spray.
Spray paint is often considered better than brush paint for several reasons. Firstly, spray paint can achieve an even coverage without any brushstrokes, resulting in a smoother finish. This is especially important when painting plastic, as brush painting on plastic can smear or create brush marks. Secondly, spray paint is much faster than brush painting, as it can cover large areas quickly and efficiently. This speed can lead to reduced labour costs, especially if hiring professionals who charge an hourly rate. However, it is important to note that spray paint usually requires more coats when painting plastic due to the non-absorbent nature of the material. Thirdly, spray paint can be useful for reaching hard-to-access areas, such as mouldings or intricate details on furniture.
While spray paint has its advantages, there are also some considerations to keep in mind. Spray paint usually requires more paint than brush painting, which can increase costs. Additionally, spray painting can be challenging for beginners, as it takes practice to apply a smooth, even coat without overspray, drips, or runs.
In conclusion, spray paint is often preferred over brush paint due to its ability to provide a smoother, faster, and more efficient finish, especially when painting plastic or intricate surfaces. However, the increased material costs and technical challenges associated with spray painting should also be considered when deciding between the two methods.
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Use a primer to prevent paint from peeling
Painting plastic can be tricky as the paint tends to drip, pool, and blotch, and quickly peels off once dried. However, it is possible to paint plastic with the right preparation. Firstly, it is important to check the paint you intend to use, as most will state what surfaces they are intended for. Paints specifically intended for plastic include Krylon Fusion for Plastic or Rust-Oleum Specialty Plastic Primer Spray. If you are using spray paint specifically meant for plastic, then you do not need to prime. However, if you are using regular spray paint, then you will need to prime the plastic first. Using a plastic primer before paint application can prevent the paint from peeling, especially if the paint is not designed for plastic.
To begin the process of priming and painting plastic, lay your item flat onto cardboard or a tarp. Next, spray it with thin, even coats of primer in one direction in a close zig-zag pattern. Do not go backwards over areas that have already been sprayed. Allow the primer to fully dry according to the can directions before proceeding.
Once the primer is dry, you can start to spray paint with your final colour. It is important to remember that plastic is not absorbent and does not soak up paint like other materials. Therefore, it is necessary to do more coats of light coverage to avoid drips. Have patience and do one light coat at a time, waiting the proper dry time between coats according to the paint directions, until your whole item is covered evenly. If the item is something that is handled or sat on, wait several days to let it totally cure before using.
If you feel like there is a slight roughness to the paint, you can use extra fine sandpaper to gently smooth out those spots in a light circular motion when the paint is 100% dry. Then, wipe the paint dust away with a dry and then a wet cloth.
In addition to priming, there are other ways to prevent paint from peeling. Firstly, it is important to ensure proper surface preparation. This includes cleaning, scraping, and sanding the surface. In some cases, it may be necessary to strip the coatings off your home using chemical stripping products. Secondly, there are specialty primers available that are designed to stop peeling, such as Zinsser's Peel Stop, which is a water-based primer that helps to glue down the edges of cracking and peeling coatings. However, these products are not miracle solutions and should not be used as a replacement for proper surface preparation.
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Clean the plastic before painting
Painting plastic can be tricky as the paint tends to drip, pool, blotch, and peel off. However, with the right preparation and paint, you can achieve a smooth and long-lasting finish.
Before painting plastic, it is important to clean the surface thoroughly to ensure the paint adheres properly. Start by laying your item on a flat surface, preferably on a cardboard box or a tarp, to protect it and the surrounding area from the cleaner and paint. If the plastic surface has mildew or heavy dirt buildup, as is often the case with outdoor items like patio chairs, tables, and fences, scrub the item with a sponge or brush and a mixture of warm water and dish soap. Rinse the surface with cool, clean water, ensuring no suds remain.
For all plastic surfaces, it is important to sand the surface to create a rough, matte finish. Since most plastic surfaces are glossy, sanding helps the paint adhere better. You can use fine sandpaper to gently buff the surface until it feels smooth. Then, wipe away the sanding dust with a dry cloth, followed by a damp cloth to ensure all residue is removed.
The final step in cleaning the plastic before painting is to wipe down the surface with a clean rag soaked in mineral spirits or isopropyl alcohol. This will remove any remaining dust and residue. Ensure you are working in a well-ventilated area when using mineral spirits, and be sure to follow proper safety precautions, including avoiding open flames as the soaked rags are flammable.
Once the plastic surface is thoroughly cleaned, dried, and free of dust and residue, it is ready for priming and painting. If you are using a spray paint specifically formulated for plastic, such as Krylon Fusion for Plastic or Rust-Oleum Specialty Plastic Primer Spray, you can skip the priming step. However, if you are using regular spray paint, it is recommended to apply a thin coat of primer, such as Rust-Oleum Specialty Paint for Plastic Spray, first.
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Paint in a well-ventilated area
Painting plastic can be a simple process to freshen up dated or dull items and make them sparkle with colour. However, it is important to take the necessary precautions and prepare the surface before painting. One of the most important precautions is to ensure that you are painting in a well-ventilated area.
The importance of painting in a well-ventilated area cannot be overstated, as paint fumes can be harmful and cause dizziness or respiratory issues if inhaled too much. The level of harm depends on the type of paint or thinner being used, and the method of application. For example, brush-painting acrylics is rarely a problem, but airbrushing them means you could inhale paint particles. Similarly, enamels and lacquers use strong-smelling chemicals that can be irritating, and while they are not likely to be fatal, it is still a good idea to ensure adequate ventilation.
There are several ways to ensure proper ventilation while painting. If possible, it is best to paint outdoors or in a room with open windows and exterior doors. If the room has no windows, you can open the door and place a box fan in the doorway to pull fresh air into the room and force the paint-fumed air out. Another fan can be placed in the corner of the room, pointing towards the door, to help circulate and direct the tainted air out. If you have a whole-house exhaust system, turning it on can provide steady airflow into the room, and closing the vents in other rooms will force more air into the space being painted. Placing buckets of water in the room is another unusual but effective method, as the water will absorb paint fumes and help eliminate odours.
In addition to these methods, it is always a good idea to wear a proper filtration mask to avoid inhaling too many fumes. Taking frequent breaks and getting some fresh air is also recommended, especially if you start to feel lightheaded. By following these precautions, you can ensure that you are painting in a well-ventilated area and minimising the potential health risks associated with paint fumes.
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Use a sealer to protect the paint job
Painting plastic can be a simple process to freshen up dated or dull items. However, it can be challenging to get paint to stick to plastic. To ensure that your paint job lasts, you can use a sealer to protect it.
Firstly, it is important to note that not all paint types work for plastic surfaces. You need to use paint specifically designed for plastic, which is often in the form of spray paint. Examples of spray paint designed for plastic include Krylon Fusion for Plastic, Rust-Oleum Specialty Plastic Primer Spray, and Fusion for Plastic Brush-On.
If you are using spray paint specifically meant for plastic, then you do not need to prime. However, if you are using regular spray paint, then it is recommended to prime the plastic first to prevent the paint from peeling. You can use a plastic primer, also known as a plastic adhesion promoter, to optimise the anchoring of the paint to the plastic surface.
Once you have painted your plastic surface, you can use a clear acrylic sealer to give your freshly painted plastic surface an extra layer of protection. Sealants are available in glossy or matte finishes, allowing you to achieve your desired look. You can apply the sealer with a brush or a spray can, depending on the size of the surface. If you are using a spray can, hold it about 10 to 12 inches away from the surface and use the same smooth, overlapping strokes as when you applied the paint.
A single coat of sealer is usually sufficient, but you may want to apply more if the item will be exposed to harsh conditions. Allow each layer to dry before applying another coat. After applying the final coat of sealer, wait at least 24 hours before handling the object to ensure that the surface is fully dry and set.
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Frequently asked questions
Yes, you can paint over plastic. However, the paint tends to drip, pool, and blotch, and once dried, it quickly peels off. It is recommended to use a spray paint specifically formulated for plastics, such as Krylon Fusion for Plastic or Rust-Oleum Specialty Plastic Primer Spray.
First, ensure the surface is clean, sound, and dry. Then, lay your item flat onto cardboard or a tarp and spray it with thin, even coats of primer in one direction in a close zig-zag pattern. Allow it to fully dry according to the can directions before proceeding. Finally, spray paint with your final colour, applying several light coats to avoid drips.
A primer is a product that optimises the adhesion of subsequent coats of paint to the surface. The shiny surface of plastic is difficult for standard primers and paints to adhere to, so using a plastic primer can help prevent paint from peeling.
Before painting, check that the paint you intend to use is suitable for plastic surfaces. Additionally, if the item you are painting is something that is handled or sat on, wait several days after painting to let it totally cure before using.
