Omar Khalid
Painting plastic is a great way to give new life to old items, but it can be tricky to get right. Paint can chip, pool, or drip on plastic, and once dried, it can quickly peel off. This is because, unlike wood, plastic is not porous, so the paint has little to stick to. However, with the right preparation, you can achieve a smooth, blemish-free finish on plastic.
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What You'll Learn
Sanding down bumps and bubbles
Before you begin sanding, wash the plastic with a detergent and degreaser using a cloth to scrub off any dirt. Affix the plastic to a secure surface so you don't have to handle it by hand. If you are sanding a car bumper, it is recommended to use 600-grit wet sandpaper and rub in alternating straight lines, spraying the bumper with water every few minutes. Keep sanding until all the rough spots have been smoothed out.
After sanding, use a wet cloth to rub the surface clean and let it dry before proceeding. If you plan to paint the plastic, it is important to sand it down to make the surface a little rougher, as this will help the paint adhere better. You can also apply a coat of primer, which will further improve paint adhesion and help to even out the surface. Let the primer dry completely before sanding it with dry 800-grit sandpaper to smoothen any bumps.
If you encounter any deep scratches or blemishes that cannot be removed by sanding, you may need to fill them with a substance such as epoxy. However, be aware that epoxy can sometimes cause air bubbles, which will need to be sanded down with high-grit sandpaper and then polished. Always remember to work in a well-ventilated area when sanding and follow all safety precautions.
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Using a primer
Painting plastic can be challenging because, unlike porous surfaces like wood, plastic is not absorbent. This means that the paint has little to stick to and tends to drip, pool, and blotch. However, with the right preparation, you can achieve a smooth, factory-finish look on plastic.
Before painting plastic, it is important to use a primer to ensure that the paint adheres to the surface. The spray-on kind is the easiest to use, but brush-on primers are also available. Choose a primer that bonds well and is specifically designed for use on plastic, such as a plastic primer or a multi-surface paint that self-primes.
When applying the primer, lay your plastic item flat on a cardboard sheet or tarp to protect your work surface. Spray thin, even coats of primer in a zig-zag pattern, moving in one direction and avoiding spraying backwards. Allow the primer to dry completely according to the manufacturer's instructions before proceeding to the next step. If you are using a sprayable primer, work in a well-ventilated area to avoid inhaling fumes.
After priming, you can proceed with spray painting your item. Choose a spray paint that is designed for use on plastic, such as Rust-Oleum or Krylon Fusion. Follow the manufacturer's instructions for preparation and application, and work in a well-ventilated area to avoid inhaling fumes. Spray light coats of paint, holding the can 8-12 inches away from the surface and tilting it at a 45-degree angle. Allow each coat to dry completely before applying the next, and be patient as you may need multiple coats to achieve full coverage.
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Choosing the right paint
Painting plastic can be challenging because, unlike wood, plastic is not porous, so the paint has little to stick to. With the right amount of preparation, however, you can paint plastic successfully. The paint you choose will depend on your preferred type of paint and finish.
Firstly, it is important to note that not every plastic surface is suitable for painting. Avoid painting plastic or laminate floors, bathtubs or shower stalls, or counters.
Before painting, it is crucial to prepare the plastic surface. Clean the item with mild dish soap and warm water to remove any surface dirt. For textured plastic surfaces, use a scrubbing brush. If the item has been painted before, use a dry brush first to remove any loose or flaking paint, then go over it with soapy water to remove any remaining dirt. If there is mildew or algae on the item, you may need to scrub harder.
Next, sand the item with fine-grit sandpaper. This will roughen the smooth surface of the plastic, giving the paint something to stick to. Super-fine sandpaper will ensure that there are no visible sanding marks. After sanding, wipe down the surface with a cloth to remove any dust, then use a cleaning agent like rubbing alcohol to remove any remaining residue.
Now, you are ready to choose your paint. It is important to select a paint that is suitable for plastic. Most paints will clearly state what materials they are intended for, but some are specifically formulated for use on plastics. These include Krylon Fusion, Rust-Oleum Universal, and Rust-Oleum Painter's Touch 2X Ultra Cover. Multi-surface paints are a good option, as they are self-priming and can be applied by brush, roller, or spray. They come in a variety of colours and finishes. Both water-based and solvent-based multi-surface paints are available for interior and exterior use.
If you opt for a paint that is not specifically designed for plastic, make sure to use a primer. The primer will help the paint adhere to the plastic surface. Choose a primer that bonds well, and apply it evenly to the surface. Allow the primer to dry completely before proceeding. If you are using spray paint, work in a well-ventilated area, and cover your work surface to protect it from overspray.
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Spray painting
Next, prepare the plastic surface. Clean the plastic with mild dish soap and warm water, or a suitable detergent, to remove any dirt, residue, or loose paint. If the item has mildew or algae, you may need to scrub harder. Once the item is clean and dry, sand the surface lightly with fine-grit sandpaper to create a rough texture for the paint to adhere to. The sandpaper should be fine enough that it does not leave visible marks on the plastic. After sanding, wipe down the surface with a cloth to remove any dust, and then use a small amount of rubbing alcohol or mineral spirits to remove any remaining residue.
Once the surface is prepared, apply a coat of primer. Primers designed specifically for plastic will adhere better to the glossy surface. Spray-on primers are the easiest to use, but brush-on primers are also available. Apply the primer in thin, even coats, moving in one direction and avoiding spraying backwards. Allow the primer to dry completely before proceeding.
Finally, you can begin spray painting. Choose a spray paint designed for use on plastic, such as Rust-Oleum or Krylon Fusion. Shake the can for a few minutes, and then test spray off to the side or on a piece of cardboard until the paint sprays freely and smoothly. Hold the can between 8 and 12 inches away from the plastic, with the can tilted at a 45-degree angle. Spray lightly across the surface, moving forward, not backward, to avoid overspray. Apply several light coats of paint, allowing proper drying time between coats, until the item is evenly covered.
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Painting over paint bleed
Identify the Cause of Paint Bleed:
Firstly, it's important to understand why paint bleed occurs. Paint bleed, or bleed-through, is commonly associated with certain types of wood, such as oak, mahogany, and pine. These woods can cause stains to appear during or after the painting process, and the stains may continue to reappear despite your efforts to cover them. Additionally, factors such as smoke residue, years of furniture polish use, or a greasy feel on thrifted furniture can contribute to paint bleed.
Prepare the Plastic Surface:
Before attempting to paint over the blemish, ensure that the plastic surface is clean and free of any dirt or grease. Use mild dish soap and warm water, and choose the appropriate cleaning tool based on the texture of the surface—a soft cloth or sponge for smooth surfaces and a scrubbing brush for textured surfaces.
Sand the Plastic Surface:
Sanding is a crucial step in preparing plastic for painting. Use super-fine sandpaper to gently sand the entire surface, creating a matte finish. This process helps improve paint adhesion and prevents issues like runs and orange peel texture. It is essential to be cautious and gentle during this step to avoid damaging the plastic underneath the paint.
Apply a Primer:
Choose a primer that is specifically designed for plastic surfaces and bonds well. A spray-on primer is usually the easiest option, but brush-on primers are also available. Apply the primer evenly over the entire surface, following the manufacturer's instructions. Allow the primer to dry completely before proceeding to the next step.
Choose the Right Paint:
Select a paint that is suitable for plastic surfaces. Look for paints specifically labelled for use on plastic or multi-surfaces. Prepare the paint according to the manufacturer's instructions, thinning it with water or a suitable paint thinner if necessary. Shake spray paint cans before use to ensure a smooth and even application.
Apply Light Coats of Paint:
When painting over the blemish, avoid applying thick coats of paint to prevent drips and pooling. Hold the paint can or spray can at a slight angle, approximately 45 degrees, and maintain a distance of 8 to 12 inches from the surface. Spray or paint lightly across the surface, using a misting technique for spray paint. Allow each coat to dry completely before applying the next, following the manufacturer's recommended drying time.
Final Touches:
Once you've applied several light coats of paint, let the final coat dry completely. If there are any dried-on drips or drops, you can carefully sand them down flat using super-fine sandpaper. Remember to work in a well-ventilated area and protect your surroundings from paint overspray.
By following these steps, you can effectively cover paint bleed and blemishes on plastic surfaces. Just remember to take your time, work in a well-ventilated area, and choose the right materials to ensure the best results.
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