Maya Ellison
Spray painting is a great way to give plastic items a new lease of life, but it can be tricky to get a smooth finish. The key to success is to take your time and work in thin coats. Before you start, make sure you've chosen the right paint for the job – you'll need paint that's designed for use on plastic. When you're ready to begin, shake the can well, then test the nozzle by spraying into the air or onto a test object. Always start spraying off to one side of the object, then sweep in a smooth motion across it, going past the edge before stopping. Let each coat dry completely before applying the next, and sand between coats if necessary to smooth out any imperfections.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Spraying technique | Start spraying off to the side of the object, sweep in one smooth motion across the object, and then stop spraying after you completely pass the end of the object |
| Number of coats | Aim for 3 coats |
| Distance from object | Spray from 10-12 inches away from the object |
| Thickness of coats | Each coat should be thin |
| Drying time | Let each coat dry for 30-45 minutes before applying the next coat |
| Paint type | Use paint made for plastic, such as Krylon Fusion |
| Sanding | Sand the paint until it is smooth before repainting. Use fine-grit sandpaper (600-2000 grit) and sand in between coats |
| Cleaning | Clean the object before repainting |
| Recoat times | Follow the recommendations on the paint can for recoat times to avoid curdling |
| Nozzle care | Ensure the nozzle sprays well by testing it before use and clean or switch it if necessary |
| Paint mixing | Shake the paint can thoroughly before use |
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What You'll Learn
Use a spray gun for a smoother finish than a rattle can
Using a spray gun can give you a smoother finish than a rattle can. Spray guns atomize the paint into smaller droplets or particles, which can help you achieve a more even finish. Here are some tips to help you get a smooth finish with a spray gun:
First, it is important to select the right spray gun and settings for your project. Different spray guns have different settings for spray pattern, material flow, spray width, and airflow. Choose a spray gun that is suitable for the type of paint you are using (water-based, oil-based, or other) and the surface you are painting. For example, if you are spraying an oil-based varnish or polyurethane, you will need to thin the finish with a fast-evaporating solvent to prevent sags and runs. You may also need to adjust the fan shape and width to get the desired spray pattern.
Second, prepare the surface properly. Correctly prepping the surface is crucial to ensuring that the paint adheres and dries properly. Depending on the type of surface, you may need to sand the entire surface or do a light scuff sanding to give the surface some "tooth" for the paint to stick to. After sanding, clean the surface thoroughly to remove any dust, debris, or grime.
Third, practice your technique. The speed at which you move the spray gun depends on the material flow, so play around with the gun to get a feel for it. When spraying, start off to the side of the object and sweep in one smooth motion across it, then stop spraying after you completely pass the object. This will help prevent paint build-up and drips. It is also important to maintain the correct distance from the object—around eight inches for wood—and to keep the gun parallel to the surface.
Finally, remember that multiple thin coats are better than one thick coat. Your first coat should be thin, and you may still be able to see the surface underneath. Aim for two to three coats, allowing proper drying time between each coat.
By following these tips and practicing your technique, you can achieve a smoother finish with a spray gun than you would with a rattle can.
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Sand the plastic surface before painting
Sanding the plastic surface before painting is an important step to ensure the paint adheres properly and to create a smooth finish. Here's a detailed guide on how to do it:
Firstly, ensure the plastic surface is clean and free of any dust, dirt, or debris. You can use a microfiber, lint-free, or tack cloth to wipe down the surface. This step is crucial because any particles left on the surface will become glued to the plastic under the paint, resulting in an uneven finish. You can also wash the plastic with soapy water to remove any stubborn grime. Once cleaned, make sure the item is completely dry before proceeding to sanding.
When sanding the plastic surface, use fine-grit sandpaper or a fine-grit sanding block. Start with a light sanding, using gentle pressure, to scuff the surface and create a texture for the paint to adhere to. If the plastic has a glossy coating, you will need to sand it down enough to remove the gloss. However, be careful not to over-sand the plastic, as you just need to create a light texture. Wipe away any dust created by the sanding process with a tack cloth or a clean rag dipped in mineral spirits or isopropyl alcohol.
After sanding, you can apply a primer to create an even smoother surface for the paint to adhere to. A spray-on primer specifically designed to work with plastic aerosol spray paints is ideal. This will also help prevent the paint from fading, peeling, or flaking over time.
Once the primer is dry, you can start spraying the paint. Hold the can at a slight angle, about 12 to 18 inches away from the plastic surface, and spray in light, even coats. Allow each coat to dry completely before applying the next one. By following these steps, you will achieve a smooth and professional-looking finish on your plastic item.
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Use a plastic primer
When it comes to spray painting plastic, the most important thing to remember is to start with a good primer to prevent the paint from peeling or chipping. Paint manufacturers have developed special spray paints that go on smoother, stick better, and resist peeling better than conventional paint. However, if you are using regular spray paint, then you will need to prime the plastic first.
There are many different paint brands that sell plastic primers, such as Rust-Oleum Specialty Paint For Plastic Spray and Krylon Fusion for Plastic. Before applying the primer, wipe down the plastic surface with mineral spirits or rubbing alcohol. This will not only clean the item but also help to break down any sealants that may have been used. Next, use a fine-grit sanding block to lightly sand the surface to a dull finish. This will provide some texture, so the primer will stick. After sanding, dust the surface using a dry brush to clear away the debris and wipe the surface with a wet cloth. Let the object dry completely before moving on to the next step.
Now you are ready to apply the plastic primer. According to Rust-Oleum, it is best to apply one thin coat, rather than one heavy coat or multiple coats, and shake the can as you spray. Be sure to follow the directions on the back of the can. Once the primer is dry, you can move on to applying the spray paint. Again, be sure to follow the directions on the can. If you are painting furniture or something that will get a lot of use, it is recommended to apply 3 to 4 coats, letting it dry between applications.
By following these steps and using a plastic primer, you can achieve a smooth and long-lasting finish on your spray-painted plastic items.
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Apply several thin coats of paint
When spray painting plastic, it is important to apply several thin coats of paint rather than one thick coat. This technique will help you achieve a smooth finish and avoid drips and bumps.
Before you begin painting, make sure to shake the can thoroughly to ensure the paint is fully mixed. Then, before spraying your object, spray the paint into the air or onto a test object to ensure the nozzle is spraying well. This step will help prevent paint clogging in the nozzle and spitting onto your object.
When applying the paint, start spraying away from the object and then glide the spray can or gun across the object in one smooth motion. Always spray past the edge of the object to ensure that the paint does not build up too thickly in one area. It is recommended to maintain a distance of 10-12 inches between the spray can or gun and the object, as this will result in a thinner coat of paint.
Allow each coat of paint to dry completely before applying the next one. The time required for drying will vary depending on the paint used, but it is generally recommended to wait at least 30-45 minutes between coats. If you are using a paint that requires a longer drying time, be sure to follow the recommendations on the can.
By following these instructions and applying several thin coats of paint, you will be able to achieve a smooth and even finish on your plastic object.
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Use a product designed for plastic adhesion
Painting plastic can be tricky as the paint tends to drip, pool, and blotch; once dried, it quickly peels off. Paint manufacturers have developed special spray paints that go on smoother, stick better, and resist peeling better than conventional paint. If you are using spray paint specifically meant for plastic, then you do not need to prime. However, if you are using regular spray paint, then you will need to prime the plastic first. Using a plastic primer before paint application can prevent the paint from peeling, especially if the paint is not designed for plastic.
Krylon Fusion All-In-One spray paint is recommended for the best adhesion to plastic. Before you start, ensure you are working in a well-ventilated area, and avoid breathing in the vapors. Keep away from any heat source, and do not eat or drink in the area. The cap should be sealed tightly when the can is not in use. Set up your workspace by laying out old cardboard instead of sheet plastic. Paint soaks into the cardboard but tends to smear on sheet plastic.
Start by holding your Krylon spray paint the recommended distance away from the surface of your project to minimize drips and areas of excess paint. These instructions will be outlined on the can. Next, apply several light coats, waiting 30-60 seconds between each, 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. Use a smooth, even sweeping motion and overlap your spray pattern by about one-third with each pass. Repeat these steps until you’ve achieved your desired look, doing the same with areas separated with painters’ tape to complete your design.
If you are looking for a more heavy-duty product, you can apply a skim coat of a 'bondo' type material made specifically for plastic adhesion. Dominion Sure Seal is a good option, but if you can't find that, any auto paint store will have a plastic fill material. Ask for something to repair a bumper, so it can handle heat and cold cycles without cracking.
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Frequently asked questions
To smooth out spray paint on plastic, you can sand it down and then apply another coat of paint. Make sure the paint is dry before sanding and use a fine grit abrasive or fine-grit sandpaper. You can also use an emery board to smooth out the paint.
To prevent bumps, apply several thin coats of paint instead of one heavy coat. Always start spraying away from the object and move smoothly across it in one motion, then stop spraying after you have passed the end of the object.
Use paint that is made for plastic, such as Krylon Fusion or SEM.
To prevent drips, shake the can well before use and spray into the air or on a test object to ensure the nozzle is working properly. Keep the can at a distance of 10-12 inches from the object and wipe away any paint build-up on the outside of the nozzle.
You can use sandpaper, a sanding block, or steel wool to smooth out spray paint. For power tools, you can use a Critter Spray Gun or a spray paint gun.
