Chloe Zhang
Painting on plastic can be challenging due to its smooth and non-absorbent surface, which makes it difficult for paint to adhere and often results in dripping, pooling, and blotching. However, with the right preparation and techniques, it is possible to achieve a smooth and durable finish on plastic items such as furniture, figurines, toys, containers, and décor items. This involves choosing the right type of paint, preparing the plastic surface, and applying the paint correctly to ensure it adheres properly and does not come off easily.
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What You'll Learn
Choose the right paint
Painting plastic can be challenging because it is not a porous material, so the paint has little to stick to. With the right preparation, however, you can paint plastic successfully.
The first step is to choose the right paint. Spray paint works especially well on plastic, but you can also use brush-on paint. If you are using spray paint, choose a spray paint labelled as being specifically meant for plastics, like Krylon Fusion for Plastic or Rust-Oleum Specialty Plastic Primer Spray. If you are using brush-on paint, choose a paint meant for plastic, such as Krylon Fusion for Plastic and Fusion for Plastic Brush-On. You can also use general-purpose spray paint, such as Krylon Paint + Primer or Rust-Oleum Universal Spray Paint, but you will need to prime the plastic first.
If you are using spray paint, it is important to shake the can before use to ensure that the paint is mixed evenly. Test the spray on a piece of paper taped to a wall before starting to paint your object. Hold the can as perpendicular to the surface as possible and move in one direction in a close zig-zag pattern, without going backwards. Apply multiple light coats, letting them dry completely between coats, rather than one heavy coat.
If you are using brush-on paint, thin the paint with water or a paint thinner to give it a smoother application and help reduce brushstrokes. You can also use a fabric medium if the plastic is flexible, to prevent the paint from cracking.
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Prepare the surface
Preparing the surface is the most important step when painting plastic, as it is not a porous material and paint does not adhere to it easily. The paint will quickly peel off once dried if the surface is not prepared properly.
Firstly, clean the plastic surface with a scrub brush. Use the brush dry first to remove any loose or flaking paint, then go over it again with soapy water to remove any dirt. If the item has mildew or algae, you may need to scrub harder. Rinse the item with fresh water and dry it off. If you are painting an item that has mildew or is heavily soiled, you can use a mixture of warm water and dish soap to scrub the plastic with a rag or sponge.
Next, sand the item with fine-grit sandpaper. This will create a rougher surface for the paint to stick to. Use a light touch and a circular motion to avoid scratches. Once you are done, wipe the surface with a tack cloth to remove any sanding dust. Make sure to get all the dust off, as it can prevent the paint from adhering properly.
If you are using spray paint, you should mask off any parts of the item that you do not want to be painted with painter's tape. This will give you a clean, defined line between the painted and unpainted areas.
Finally, if you are using regular spray paint, you will need to prime the plastic. Apply thin, even coats of primer, moving in one direction in a close zig-zag pattern. Allow the primer to dry completely before proceeding. If you are using spray paint specifically meant for plastic, you do not need to prime.
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Use a primer
When painting on plastic, using a primer is crucial to ensure that the paint adheres properly and does not come off. A primer is a preparatory coating that is applied to a surface before painting, and it is specifically designed to improve the adhesion of the paint to the plastic surface.
There are several types of primers available in the market, but not all primers are suitable for plastic. Hence, it is important to select a primer that is specifically designed for use on plastic surfaces. These primers are often labelled as
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Apply multiple light coats
Painting plastic can be challenging because it is not a porous material, so the paint has little to stick to. However, with the right preparation and paint application, it is possible to achieve a smooth and durable finish. One crucial step is to apply multiple light coats of paint, rather than a single heavy coat.
When painting plastic, it is important to remember that less is more. Applying light coats of paint will help to avoid drips, runs, and sags, which can occur when too much paint is applied in one spot. Light coats also allow for better adhesion between coats, as the paint dries completely before the next coat is applied. This helps to create a smooth and even finish.
To apply light coats of paint, hold the spray can or brush at a perpendicular angle to the surface and use a zig-zag or back-and-forth motion. For spray paint, it is important to shake the can periodically to keep the paint mixed evenly and to test spray before applying to the surface. Start by tack coating the first pass for about 50% coverage, which gives subsequent coats something to adhere to.
Allow each light coat to dry completely before applying the next. The drying time may vary depending on the paint you are using, so refer to the manufacturer's instructions. It is important to be patient throughout the painting process, as rushing may result in uneven coverage or drips.
By applying multiple light coats of paint, you can achieve a smooth and durable finish on plastic surfaces. This technique, along with proper surface preparation and the use of suitable paints, will help ensure that your paint job lasts without chipping or peeling.
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Seal with varnish
Sealing acrylic paint on plastic with varnish is a great way to upcycle old plastic items and incorporate them into your crafts. It is also a way to prevent your plastic crafts from losing their colour.
There are several types of varnish that can be used to seal acrylic paint on plastic. The first is an acrylic polymer varnish, which is formulated with UV protection to prevent discolouration. The second is an acrylic resin varnish, which is very strong and durable, with a glossy and shiny finish that does not become cloudy after a thick coat. This type of varnish is suitable for small projects that require a stiff and strong surface, such as coasters or jewellery beads.
Another option is to use Mod Podge, a diluted permanent white glue, as a top coat on acrylic paint. Mod Podge acts as a sealer and provides a glossy finish. To apply Mod Podge, choose a brush that you will not use for painting, as the glue will make it stiff. Be sure to apply the glue evenly, as patchy layers will dry with an unintended texture. The layer of glue needs to be light, as heavy coatings will not dry as fast. It is better to apply two or more light coatings rather than one heavy coat. It will take 15 to 20 minutes for the thin layer to dry.
It is important to note that acrylic paints are self-sealing, so there is no need for another sealer. However, you may want to go the extra mile to protect the paint, as plastic surfaces need extra protection.
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Frequently asked questions
First, clean the plastic surface with a scrub brush. If the item has been painted before, use the brush dry to remove any loose or flaking paint. Then, go over it with soapy water to remove any surface dirt. If the item is outdoor furniture, you may need to scrub harder to remove mildew or algae. Next, sand the item with fine-grit sandpaper to roughen the smooth surface and give the paint something to stick to. Finally, clean off the sanding dust with a dry cloth, followed by a wet rag with mineral spirits or isopropyl alcohol.
Choose a paint that is suitable for plastic. Spray paint works especially well, but you can also use acrylic or enamel/model paint. Check the label for indications that the paint is suitable for plastic. If you are using spray paint specifically meant for plastic, you do not need to prime. However, if you are using regular spray paint, you will need to prime the plastic first.
If you are using spray paint, work in a well-ventilated area, and protect your work area from overspray. Hold the can as perpendicular to the surface as possible, and spray in one direction in a close zig-zag pattern. Do not move the can backward as you spray. Apply multiple light coats, allowing each coat to dry completely before applying the next. If you are using a paintbrush, thin the paint with water or a paint thinner to achieve a smoother application and reduce brushstrokes.
