Omar Khalid
Spray paint is a great way to give plastic items a new lease of life, but it can be a tricky material to work with. To ensure your paint job is durable, it's important to prepare the surface properly and use the right products. So, what coating should you apply over spray paint on plastic? The short answer is: a primer. Using a primer will help prevent the paint from peeling, chipping, or cracking. You can use a clear primer to protect your paint job and ensure it lasts longer, especially if the item will be kept outside.
| Characteristics | Values |
|---|---|
| Preparation | Clean the plastic surface with a damp rag, sanitiser, or mineral spirits to remove dust, dirt, or mildew. |
| Lightly sand the surface to create a matte finish, especially if the plastic is old or has a glossy finish. | |
| Set up a protected work area, using cardboard or a drop cloth to avoid getting paint on unwanted surfaces. | |
| Ensure good ventilation and avoid heat sources when working with mineral spirits. | |
| Paint Type | Use a spray paint specifically designed for plastic, such as Krylon Fusion for Plastic, Rust-Oleum Universal Spray Paint, or Liquitex. |
| For outdoor plastics, use a spray paint designed for that purpose, such as Krylon Fusion All-In-One or Rust-Oleum Specialty Plastic Primer Spray. | |
| For interior plastics, use a top-quality acrylic spray paint. | |
| Application Technique | Hold the can 12-18 inches (30-46 cm) away from the object, tilting it at a 45-degree angle. |
| Apply light, even coats, waiting 30-60 seconds between each coat, and always start and finish off the object. | |
| Avoid pointing the nozzle directly at one spot to prevent uneven application. | |
| Use a smooth, even sweeping motion, overlapping each pass by about one-third. | |
| Apply multiple coats, allowing each coat to dry completely before applying the next. | |
| For furniture, apply 3-4 coats and protect the final coat with a clear primer. | |
| Drying and Curing | Spray paint typically dries in 8-30 minutes, but it needs about 3 hours to fully cure. |
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What You'll Learn
Preparing the plastic surface
Firstly, set up your workspace in a well-ventilated area, away from other surfaces that you do not want to get paint on. It is recommended to work on a drop cloth or cardboard to protect the floor and surrounding areas from paint overspray. You can also create a single-use spray booth with a cardboard box for added protection. Remember to always wear a painting mask to protect yourself from paint fumes.
Next, clean the plastic surface thoroughly. For smaller items, fill a sink with warm water and add a small amount of liquid dish soap. Use a cloth to wash the item. Alternatively, use a bucket with soapy water and a sponge for larger items. Ensure you remove all dust, dirt, or grime that could prevent the paint from adhering properly. If there is mould or mildew present, use an all-purpose or sanitizing cleaner and allow the item to dry completely before proceeding.
Once the item is clean and dry, it is time to sand the surface lightly. Use fine-grit sandpaper to create a slightly textured surface for the paint to adhere to. This step is especially important if the plastic surface is glossy, as it will help the paint stick better. Make sure to wipe away any dust created by the sanding process.
If there are any cracks or damage to the plastic, repair them before proceeding. Small cracks can be easily fixed with high-strength plastic glue, while larger issues may require a soldering iron.
Finally, if you are using a primer, apply it now. A primer will help the paint adhere better and achieve a smoother finish. Spray primers specifically designed for plastic, such as Krylon Fusion for Plastic or Rust-Oleum Specialty Plastic Primer Spray, are recommended. Follow the manufacturer's instructions for the best results.
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Choosing the right paint
Paint Type
It is important to select a paint specifically designed for plastic surfaces. These paints are formulated to adhere properly to the unique chemical composition and smooth surface of plastic, reducing the likelihood of flaking, peeling, or cracking. Look for products labelled as being suitable for plastics, such as Krylon Fusion for Plastic or Rust-Oleum Specialty Plastic Primer Spray.
Primer
Using a primer before painting is crucial when it comes to plastic surfaces. A primer will help the paint adhere better, resulting in a longer-lasting finish. Choose a primer that is compatible with your chosen paint, such as a high-adhesion latex stain-blocking primer for interior walls or a plastic primer for outdoor furniture.
Finish
Consider the desired finish for your project. Do you want a glossy, semi-gloss, or matte look? Keep in mind that a glossy finish may require more preparation, as paint tends to adhere better to a matte surface. You can lightly sand glossy plastic to create a matte finish before painting.
Colour
Select a paint colour that complements your decor or the intended design. Many spray paints designed for plastic, such as Krylon and Liquitex, offer a wide range of colours to choose from, including sophisticated hues and bold shades.
Application Method
Spray paint is generally the best application method for plastic, as it can be difficult to achieve a smooth finish with a brush on plastic surfaces. Spray paint allows for light, even coats, reducing the risk of drips and providing a more professional finish.
Number of Coats
Plan to apply multiple thin coats of paint rather than one heavy coat. This will help prevent runs, sags, and drips, and ensure a more durable finish. Depending on the object and its intended use, you may need between two and four coats of paint.
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Applying the paint
When it comes to painting plastic, preparation is key. Plastic is not a porous material, so paint doesn't absorb into it in the same way as wood, paper, or cardboard. This means that paint can drip, pool, and blotch, and once dried, it can quickly peel off. However, with the right preparation and products, you can achieve a smooth and durable finish on plastic.
Firstly, set up your workspace in a well-ventilated area, away from other surfaces, as spray paint overspray tends to carry. It's a good idea to work on cardboard rather than sheet plastic, as paint soaks into cardboard but can smear on sheet plastic.
Next, clean the plastic surface with a damp rag, soapy water, or mineral spirits to remove any dust, dirt, or grime that could prevent the paint from adhering. If there is mould or mildew present, use an all-purpose or sanitizing cleaner and allow the item to dry completely. If the plastic is older, you may also need to remove any loose paint or other coatings. Once the item is clean and dry, use fine-grit sandpaper to lightly sand the entire surface you'll be painting. This will help to create a matte finish, which paint can adhere to more easily.
Now you're ready to start painting. Shake the can of spray paint well, then hold it 12 to 18 inches from the plastic object and spray a light coat of paint, sweeping the can back and forth in a vertical or horizontal motion as you spray. Keep the can in motion to avoid an uneven application. Apply several light coats, waiting 30-60 seconds between each coat, until you're satisfied with the appearance. Always start and finish your spray pattern off the object and release the spray tip at the end of each pass. This ensures even coverage across the entire surface.
Most items will benefit from at least two coats of spray paint, and some may need three or four coats. Let each coat dry completely before applying the next one. Spray paint typically requires anywhere from eight to 30 minutes to dry, but always consult the manufacturer's directions on the can for exact drying times. Once you've applied the final coat, let the item dry for at least three hours before using it again. This is the curing time, which is how long it takes for the paint molecules to fully bond and harden.
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Drying and curing times
To speed up the drying time, it is recommended to work in a well-ventilated area with low humidity, as this encourages the water in the paint to evaporate faster. Warmer temperatures also help the paint dry more quickly, with ideal room temperatures between 65 and 85 degrees Fahrenheit. Using a fan to increase air circulation can also reduce drying times.
It is important to note that plastic is a challenging surface to spray paint due to its smooth and non-porous nature, which makes it difficult for the paint to adhere properly. To improve adhesion, it is recommended to clean and lightly sand the plastic surface before painting. Additionally, using a spray paint specifically designed for plastic, such as Krylon Fusion for Plastic or Rust-Oleum Specialty Plastic Primer Spray, can improve adhesion and drying times.
While the paint may feel dry to the touch within 30 minutes to an hour, it is advisable to wait at least 3 hours for the paint to fully cure and harden. This curing time ensures that the paint is at its maximum strength and resistance to moisture, temperature changes, and physical wear.
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Priming and sealing
Priming
Before applying primer, it is crucial to clean the plastic surface thoroughly. Wash the plastic item with soapy water or a mild all-purpose cleaner to remove any dust, dirt, or grime that could prevent the paint from adhering properly. Once the item is clean, dry it completely. If there is any loose paint or other coatings on the plastic, remove them. You can use a piece of fine-grit sandpaper to lightly sand the entire surface, creating a matte finish that promotes better paint adhesion.
After preparing the surface, it's time to choose the right primer. Several paint brands offer plastic primers, such as Rust-Oleum, which is specifically designed for plastic surfaces. Apply the primer according to the manufacturer's instructions, ensuring that you follow the recommended application techniques and drying times.
Sealing
Once you have completed the spray painting process and allowed the final coat to dry, it is important to seal the paint to protect it from the elements, especially if the painted item will be used outdoors. You can do this by spraying the entire piece with a clear primer or sealant. This step will help prevent the paint from peeling, chipping, or cracking over time.
When choosing a sealant, opt for a product specifically designed for use on painted plastic surfaces. Follow the manufacturer's instructions for application, as different sealants may have varying requirements for drying and curing times.
By following these priming and sealing steps, you can ensure that your spray-painted plastic item will have a durable and long-lasting finish. Remember to work in a well-ventilated area and always refer to the product instructions for the best results.
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Frequently asked questions
A clear primer can be applied over spray paint to protect the paint job. This is especially important for objects that will be kept outside and are subject to the elements.
First, set up your workspace on a protected surface like cardboard. Clean the plastic with a damp rag or soapy water to remove any dust, dirt, or grime. If there is mould or mildew, use an all-purpose or sanitising cleaner and let it dry completely. If the plastic is old, remove any loose paint or other coatings. Then, lightly sand the plastic until it has a matte finish.
Always follow the manufacturer's instructions on the can. Shake the can and hold it 12 to 18 inches from the object. Apply light coats, waiting 30-60 seconds between each coat. Avoid pointing the nozzle at a single spot and keep the can in motion as you spray.
Spray paint typically dries in 8 to 30 minutes, but it needs about three hours to cure. Curing is when the paint molecules fully bond and harden.
Paint manufacturers have developed special spray paints that are designed for use on plastic. These include Krylon Fusion All-In-One, Rust-Oleum Universal, and Liquitex.
