Maya Ellison
Painting plastic can be a tricky endeavour. Plastic is non-porous, meaning the paint doesn't seep in and adhere; it merely sits on the surface, making it more prone to flaking or chipping. However, with the right preparation, you can paint plastic with success and give new life to old items. This involves choosing the right type of paint and primer, preparing the surface, and applying a protective layer to make it waterproof.
How to paint plastic waterproof
| Characteristics | Values |
|---|---|
| Surface preparation | Clean the plastic surface with a scrub brush, mild dish soap, and warm water. Use a soft cloth or sponge for smooth surfaces and a scrubbing brush for textured surfaces. Alternatively, use methylated spirits or a degreasing agent for a residue-free surface. |
| Sanding | Lightly sand the surface with fine sandpaper to create a rough texture that paint can adhere to. Remove all sanding dust before painting. |
| Primer | Apply a plastic-specific primer in light coats to improve paint adhesion. Spray-on primers are easier to use than brush-on primers. |
| Paint | Choose a paint specifically formulated for plastics, such as Krylon Fusion, Rust-Oleum Universal, or Rust-Oleum Painter's Touch 2X Ultra Cover. Acrylic, epoxy, and enamel paints work well on plastics, providing a hard, smooth coat. |
| Sealer | Apply a clear acrylic sealer or varnish over the painted surface to make it waterproof. Ensure the paint is completely dry before applying the sealer to avoid smudging. |
| Spray painting | Spray painting is best done outdoors due to fumes and overspray. Cover your work surface and work in a well-ventilated area. Check the paint can for temperature requirements. |
| Drying time | Let the paint dry for at least 24 hours to ensure it is fully set. Refer to the manufacturer's instructions for specific drying times. |
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What You'll Learn
Use a plastic-specific primer for better adhesion
Painting plastic can be tricky because, unlike wood, plastic is not porous, so the paint doesn't seep in and adhere; it merely sits on the surface, making it more prone to flaking or chipping. To combat this, it is a good idea to use a plastic-specific primer first for better adhesion.
Before applying a plastic-specific primer, it is important to prepare the plastic surface. This involves cleaning the surface with a scrub brush to remove any loose paint or dirt. If the item has mildew or algae, you may need to scrub harder. Once the surface is clean, it should be roughed up with sandpaper to create a texture that the primer can adhere to. After sanding, be sure to wipe away any sanding dust with a cloth or sponge.
When choosing a primer, opt for one that is specifically designed for plastic. These primers have excellent adhesion properties and will help the paint stick to the plastic surface. Apply the primer in light, even coats. The spray-on kind is usually the easiest to use, but brush-on primers are also available.
After applying the primer, be sure to follow the manufacturer's instructions for drying time. Once the primer is dry, you can proceed with painting the plastic surface. It is important to use a paint that is suitable for plastic, as regular paint may not adhere well and could chip or flake over time.
By taking the time to properly prepare the surface, using a plastic-specific primer, and choosing the right paint, you can achieve a long-lasting and attractive finish on your plastic items.
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Sand the surface to avoid paint issues
Sanding the surface of plastic is a crucial step in preparing the material for paint. Plastic is a tricky surface to paint because, unlike wood, it is non-porous, so the paint doesn't seep in and adhere; it merely sits on the surface, making it more prone to flaking or chipping. By sanding the surface, you create a rough texture that allows the paint to grip and stick better. This is especially important for glossy or shiny plastics, as they can be challenging for paint to adhere to, often resulting in issues like runs and orange peel texture.
Before you start sanding, it's essential to clean the plastic surface thoroughly. Use a scrub brush to remove any loose or flaking paint if the item has been painted before. Then, use some soapy water or a mild dish soap and warm water to remove any dirt, grease, or grime. If the item is outdoor furniture or has been exposed to the elements, you may need to put in some extra effort to remove mildew, mould, moss, or algae. You can use a fungicidal wash for this step. Once the surface is clean, wipe it down with rubbing alcohol or a suitable degreasing agent to ensure a residue-free surface that is ready for sanding and coating.
When sanding plastic, use fine-grit sandpaper to create a uniform texture across the surface. Sand the plastic gently and evenly, ensuring you don't create any deep scratches or grooves. After sanding, wipe away any sanding dust with a clean, dry cloth. This step is crucial, as any residual dust can interfere with the paint adhesion.
By properly sanding and preparing the plastic surface, you'll create a better base for the paint to adhere to. This will help you achieve a smoother, more durable finish and reduce the likelihood of paint chipping, cracking, or peeling over time. Remember that plastic is prone to expanding and contracting with temperature changes, so it's essential to use a flexible paint designed for plastics to accommodate this movement and ensure long-lasting results.
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Choose a paint formulated for plastic
Painting plastic can be tricky because, unlike wood, plastic is not porous, so the paint has little to stick to. With the right preparation, however, you can successfully paint plastic. It's important to use a paint that is specifically formulated for plastic to achieve long-lasting, high-quality results.
The shiny surface of plastic is difficult for standard primers and paints to adhere to. Plastic primers and paints are designed to have excellent adhesion properties to help combat this issue. Acrylics, epoxy, and enamel paints work best on plastics because they provide a hard, smooth coat on surfaces that are not porous. You can also use latex paint for indoor PVC items, as it is known for its ease of application and cleanup. However, latex paint might not be as durable as other options when exposed to external elements.
There are several paint lines that are specifically formulated for plastics, such as Krylon Fusion, Rust-Oleum Universal, and Rust-Oleum Painter's Touch 2X Ultra Cover. These paints are designed to have better adhesion to plastic surfaces and will help your paint job last longer. It's also important to consider the type of plastic you are working with, as some paints may not be suitable for all plastic types. For example, PVC can benefit from the protective and flexible features of elastomeric paints, especially when exposed to varying weather conditions.
In addition to choosing the right paint, there are several steps you should take to prepare the plastic surface before painting. First, clean the surface with mild dish soap and warm water to remove any dirt or residue. If the plastic has a glossy finish, you may need to rough up the surface with fine-grade abrasive paper or sandpaper to help the paint adhere better. You should also apply a coat of primer, preferably a plastic-specific primer, to further improve adhesion and help the paint stick to the surface. Once you have completed these preparation steps, you can move on to painting the plastic surface with your chosen paint.
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Seal with a waterproof/food-safe sealer
To seal painted plastic with a waterproof/food-safe sealer, you can use a clear water-based polyurethane, acrylic, or polyacrylic sealer. These are suitable for use on painted wood or other surfaces to form an extra layer of durability and protection.
There are also penetrating oil sealers that are food-safe, such as:
- Pure Tung Oil from The Real Milk Paint Company (used with GRAS Citrus Solvent)
- Pure Linseed Oil from Tried and True (with no driers or other additives)
- Pure Hemp Oil from The Real Milk Paint Company
- Pure Walnut Oil with Carnauba Wax from The Real Milk Paint Company
- Rubio Monocoat Oil Plus 2C, a linseed oil-based interior finish that comes in clear and coloured stains
These penetrating oil sealers are only food-safe if they are all-natural and the raw ingredients are on the list of approved ingredients or GRAS (generally regarded as safe).
Epoxy coatings are another option, forming a thick barrier between the paint and the user. They are considered food-safe by the FDA, although they are strong in odour and VOCs when wet, and the cure time can be longer than stated.
Shellac is another option, as it is a solvent-based sealer that dries very fast. However, it is important to note that solvent-based sealers can take a long time for the solvents to flash off, and they may not be suitable for food contact until they have cured for at least a month.
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Work in a well-ventilated area
Painting plastic can be tricky because, unlike wood, it is not porous, so the paint has little to stick to. With the right preparation, however, you can paint plastic successfully.
If you are using spray paint, it is important to work in a well-ventilated area. Spray painting produces fumes and overspray, so it is best done outside whenever possible. If you are working inside, make sure the room is well-ventilated by opening windows and doors. You should also put down a tarp, plastic sheet, or a large piece of cardboard to protect your work surface and the surrounding area from paint.
Before painting, it is important to prepare the plastic surface. Clean the item with mild dish soap and warm water to remove any dirt or residue. If the item has been painted before, use a scrub brush to remove any loose or flaking paint. Go over the surface again with soapy water to ensure it is clean. If the item is outdoor furniture, you may need to use a stronger cleaning agent to remove mildew or algae. You can also use a degreasing agent to remove any oils that might prevent the paint from sticking. Once the surface is clean, lightly sand it with fine-grit sandpaper to create a rough texture that will help the paint adhere. Wipe away any sanding dust before painting.
It is also important to use the right type of paint and primer when painting plastic. Choose a paint that is specifically formulated for use on plastic, such as acrylic, epoxy, or enamel paints. These types of paint provide a hard, smooth coat that will adhere better to non-porous surfaces. In addition, use a plastic-specific primer to help the paint stick to the surface. Apply the primer in light, even coats after sanding and cleaning the surface.
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Frequently asked questions
First, ensure the plastic is suitable for painting. Older plastics can become brittle, so check for soundness. Next, clean the plastic with a scrub brush, soapy water, and a soft cloth or sponge for smooth surfaces. If there is mildew or algae, you may need to scrub harder. Then, use fine-grade sandpaper to roughen the surface, and wipe away the sanding dust. Finally, apply a plastic-specific primer.
Acrylics, epoxy, and enamel paints work best on plastics because they provide a hard, smooth coat. You can also use a multi-surface paint, which is self-priming and can be applied by brush, roller, or spray. If you are painting PVC, use a flexible paint like elastomeric paint.
To make paint on plastic waterproof, apply a clear acrylic sealer or varnish over the painted surface. This will act as a protective layer to prevent moisture from reaching the paint.
Plastic is not porous, so the paint will not adhere as well as it would on a porous surface like wood. It will merely sit on the surface, making it susceptible to flaking or chipping. Therefore, it is important to prepare the surface well and use a primer to help the paint stick. Additionally, be sure to work in a well-ventilated area and put down a tarp or plastic sheet to protect your work area.
As a general rule, it is advisable to let the paint dry for at least 24 hours to ensure it is fully set. However, drying time can vary based on the type of paint and environmental conditions, so be sure to check the manufacturer's instructions for specific drying times.
