Plastic is a difficult surface to paint. Unlike wood, plastic is not porous, so paint is difficult to stick to the surface. Luckily, thanks to the right preparation, you can paint your plastic so that it looks beautiful. However, keep in mind that depending on the type of paint and plastic used, the paint may eventually peel off after frequent use.
Step
Part 1 of 3: Preparing the Plastic Surface
Step 1. Choose a plastic object to paint
With the right preparation, you can paint on any surface. Objects such as furniture, miniatures, toys, containers, and decorations can be painted to make them look more beautiful.
Not all plastic surfaces are suitable for painting, for example: plastic/laminate flooring, walk-in tub/shower or kitchen counter.
Step 2. Clean the item with mild soap and warm water
This will remove any dirty surfaces and reduce the work that needs to be done later. Use a soft cloth or sponge for smooth surfaces, and a scrubbing brush for textured surfaces (such as patio furniture). After that, rinse with clean water, then dry.
Step 3. Scrub the plastic surface with 220-300 grit sandpaper
Rub lightly and in a circular motion so as not to scratch. When finished, wipe with a tack cloth (car washcloth).
This sanding is important to make the smooth surface slightly rough so the paint can stick better to the plastic
Step 4. Rub rubbing alcohol on the plastic surface
This step is very important because it will remove any excess oil that reduces the adhesion of the paint. If you don't, the paint will peel off easily.
Handle plastic with care. Hold things around the edges, or wear disposable gloves.
Step 5. Cover any areas you don't want to paint using masking tape
This step is fine even if you are using a brush to apply paint. The masking tape will help create a clean, straight line between the painted and unpainted areas.
Step 6. Apply a coat of primer
You need to use a primer, preferably one that can stick firmly. This step helps flatten the surface of the plastic and provides a "base" for the paint to stick firmly. There are spray primers that are very easy to use, but you can also use a liquid primer that works with a brush.
- Allow the primer to dry completely before continuing.
- If you use a spray primer, make sure to cover the work area and work in a well-ventilated area.
Part 2 of 3: Painting Plastic Surfaces
Step 1. Prepare the workplace
Choose a place that has good lighting. Cover your workplace with newsprint or cheap plastic tablecloths. If you're going to use spray paint, try to work in a well-ventilated area, ideally outdoors.
If there are plastic parts that you don't want to paint, cover them with masking tape
Step 2. Choose a suitable paint for the plastic
Spray paint is quite effective, especially on plastic, but you can also use acrylic or enamel/model paints. It would be better if the paint was specifically designed for plastic. Check the label on the paint package, and look for words like " Plastic " or " Multi-Surface " (various surfaces).
Step 3. Prepare the paint, if needed
Some types of paint can be used immediately, while others require preparation in advance. Before starting to paint, check to see if there are any special instructions that are usually listed on the label on the paint package.
- Shake the spray paint can for a few minutes. This step ensures that the paint mixes evenly so that it is ready to use and gives a smooth, silky finish.
- Dilute the acrylic paint with enough water to get a creamy consistency. This will make the paint smoother and easier to apply.
- Some model paint/enamel also needs to be diluted. In most cases, you will need a thinner specifically designed for enamel paint; which is usually sold with other enamel paints.
Step 4. Apply an even layer of paint
Don't worry if the first coat of paint doesn't cover the entire surface as you'll be applying several coats of paint. This is important, whether you use spray paint or liquid paint.
- Hold the paint can 30-45 cm from the plastic surface. Spray the paint in a sweeping motion.
- Apply acrylic paint using a Taklon, Kanekalon, or sable brush.
- Apply enamel/model paint using a stiff bristle brush. These brushes are usually sold with other paint models.
Step 5. Apply more light coats of paint
Allow each coat of paint to dry before applying the next coat. Alternate your painting direction for each new layer, eg apply sideways on the first layer, and up and down on the second layer, then back sideways for the third layer. The number of coats of paint depends on the desired coverage. In most cases, you will need 2-3 layers.
How long does it take for paint to dry depending on the type of paint used.
For most types of paint, usually only needed 15-20 minutes.
Allow the final coat to dry for 24 hours.
Step 6. Allow the paint to dry completely after applying the last coat
At this point, your project is complete and ready to use. If you want to add detail to the outermost layer of paint, continue to the next section. If you previously attached a masking tape, remove it now. Pull carefully so the paint doesn't peel off.
Part 3 of 3: Repairing and Sealing Paint Surfaces
Step 1. Patch the peel or pry with a brush
Examine objects carefully. If any part of the paint is peeling off or is completely blank, fix it with paint and a thin brush. If you previously used spray paint, it's best to use acrylic paint of the same color and cover paint.
Step 2. Add details, stencils, or weather, if you want
This step is completely optional, but will make things more lively, especially for decorations and miniatures. Here's how to get started:
- Apply the stencil to the object, then color it in using spray or acrylic paint and a foam brush.
- Use a thin, pointed brush on small parts and designs.
- Add highlights with bright paint, and shadows with dark paint.
Step 3. Apply a thin layer of polyurethane sealant to make the item last longer, if desired
You can use spray paint or brush, but spray paint will give the best results. Apply a thin layer of sealing and leave for 30 minutes to dry. If necessary, apply another 1-2 coats and wait 30 minutes between each coat.
- Choose a sealer whose finish is right for you, such as matte, satin, or glossy.
- Several thin layers of sealing are better than one thick layer which will feel sticky.
Step 4. Allow the paint and sealer to dry completely
Just because something feels dry to the touch doesn't mean it's completely dry. Read paint and sealing labels to find out how long it will take for the material to dry.
Many enamel paints take several days to dry. During this time, the paint tends to peel or chip easily
Tips
- If you're only painting a portion of the plastic, don't sand it, as the difference in texture will be obvious.
- If you only want to paint details on the plastic, such as flowers, choose a cover paint that matches the plastic, i.e. glossy or opaque.
- Some types of paint last longer than others. For best results, look for paints that are specifically labeled for plastic.
- If you're painting a multi-sided object, such as a box, work on one side at a time.
- If the spray paint starts to drip or pool, it means you sprayed too thickly. Stay away from objects and spray in a dab.
Warning
- Some types of plastic will repel paint, even if they are prepared in such a way. In this case, there is nothing you can do.
- Make sure you're working in a well-ventilated area so you don't inhale paint, sealants, or mineral spirit fumes.
- Paint on objects that are often used will eventually peel off.
