Chloe Zhang
Spray painting plastic tubs can be a great way to cover up old stains, change the colour of your tub, or create a unique design. However, it is important to note that because plastic is smooth and non-porous, most paints won't adhere to it. To combat this, you can sand the surface of the plastic to give the paint something to grip onto. You can also use a specific bonding agent as a primer, which will help smooth out the surface of your tub and allow your paint to adhere better. Additionally, you can try flashing the plastic with a flame to remove any oils from the surface before painting.
Characteristics and Values Table for Spray Painting Plastic Round Tubs
| Characteristics | Values |
|---|---|
| Paint Type | Acrylic Enamel, Plastic Adhering Spray Paint, Outdoor Paint, Krylon Spray Paint |
| Surface Preparation | Sanding, Cleaning with Plastic Prep Spray, Flashing with Flame |
| Primer | Recommended, e.g., Gripper Primer by Glidden, Home Depot |
| Bonding Agent | Required for better adhesion and finish |
| Application Method | Spray, Roller |
| Durability | Prone to Scratches and Abrasions, Peeling |
| Environment | Not recommended for humid environments |
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What You'll Learn
Sand the surface of the plastic tub
Sanding the surface of the plastic tub is an important step in preparing it for spray painting. It helps create a texture that the paint can adhere to, ensuring a smooth and even finish. Here is a step-by-step guide to sanding your plastic tub:
- Clean the Tub: Before you start sanding, make sure the tub is clean and dry. Wash the tub with soapy water or an all-purpose cleaner to remove any dust, dirt, or oils from the surface. This step is crucial because any residue on the surface will affect the paint's adhesion and the final appearance.
- Choose the Right Sandpaper: Opt for fine-grit sandpaper or a fine-grit sanding block. The fine grit will create a smooth finish and is ideal for preparing plastic surfaces for painting. Avoid using coarse sandpaper, as it may leave deep scratches that will be more challenging to paint over.
- Start Sanding: Using gentle pressure, sand the entire surface of the tub that you plan to paint. Work in small sections to ensure thorough coverage. Remember to sand with the grain of the plastic, following the contours of the tub. This process will help remove any glossy finish and create a slightly textured surface for the paint to grip onto.
- Remove Dust: After sanding, use a microfiber cloth, a tack cloth, or a clean rag to wipe away all the dust and plastic particles generated during the sanding process. Leftover dust will interfere with the paint's adhesion, so ensure the surface is entirely dust-free before moving on to the next step.
- Repeat if Necessary: Depending on the initial condition of your tub and the desired level of texture, you may need to repeat the sanding process. If you're aiming for a more pronounced texture, you can use slightly more pressure during the second round of sanding. However, always remember to remove the dust again after each sanding session.
- Prepare for Painting: Once you're satisfied with the sanding, your tub is now ready for the next steps in the painting process. Refer to other sections of this guide or additional resources for instructions on choosing the right paint, preparing your work area, and applying the paint effectively. Remember to always work in a well-ventilated area when spray painting.
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Use a bonding agent for a smooth finish
Painting plastic can be tricky, and it's always a good idea to prepare the surface thoroughly before painting. One way to ensure a smooth finish when spray painting plastic round tubs is to use a bonding agent, also known as a bonding primer. This is especially important if the plastic will be exposed to the elements or subjected to day-to-day use, as it will help the paint adhere to the surface and prevent chipping, peeling, and scratches.
There are several bonding primers on the market, such as Valspar, that can be used to prepare plastic surfaces for painting. Before applying the bonding primer, it is important to clean the plastic thoroughly to remove any oils or dirt. Some sources recommend using a product like "Vinyl & Plastic Prep" spray cleaner, while others suggest a more intensive preparation, such as flaming the plastic to remove surface oils.
Once the plastic is clean and dry, the bonding primer can be applied. It is important to follow the manufacturer's instructions for the specific product you are using, as the settings on your paint sprayer may need to be adjusted due to the thicker consistency of the primer. You will also need to allow adequate time for the primer to dry completely before applying paint.
After the bonding primer has been applied and dried, you can begin spray painting the plastic round tubs. Again, be sure to follow the manufacturer's instructions for the paint you have chosen, including any recommended drying times between coats.
Using a bonding agent or primer before spray painting plastic round tubs will help ensure a smooth and durable finish. By preparing the surface properly, you can avoid common issues such as chipping, peeling, and scratches, resulting in a professional-looking finish that will last for years.
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Choose the right paint for the job
Choosing the right paint for your plastic round tub is crucial to ensure that the paint adheres to the surface and that your new paint job is long-lasting. Here are some factors to consider when selecting the appropriate paint:
Type of Paint
The type of paint you choose is critical as most paints won't adhere to plastic due to its smooth and non-porous surface. It is recommended to use paint specifically designed for plastic surfaces. These paints are formulated to bond with the plastic surface and provide a durable finish. Some popular options include Krylon Fusion and generic paints for plastics, which can be found at many big-box stores.
Primer
Using a primer is essential when painting plastic. A primer will help prepare the surface of the plastic, making it easier for the paint to adhere. Look for a bonding agent or primer specifically designed for plastic surfaces. The Glidden Gripper primer is highly recommended by some users for its strong adhesion. You can also consider using a "Vinyl & Plastic Prep" spray cleaner before priming to ensure the surface is ready for painting.
Finish
When choosing a paint finish, opt for acrylic enamel. This type of paint is recommended for plastic tubs and showers as it provides a durable and smooth finish. Acrylic enamel can be purchased in a spray bottle or a tub, and if you go for the latter, use a small roller for a streak-free finish.
Environment
Consider the environment in which your painted tub will be placed. If it will be exposed to outdoor elements, choose a paint that can withstand weather conditions and, if possible, protect against scratches and abrasions. If the tub will be placed in a humid environment, such as a bathroom, ensure you follow the necessary preparation steps and use an appropriate bonding agent to help the paint adhere and last longer.
Colour
While colour may not seem like a critical factor, choosing the right colour can impact the overall aesthetics of your project. Consider the surrounding environment and choose a colour that complements or contrasts tastefully with the space. If you're looking for a natural, earthy tone, a terra cotta colour could be a great option.
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Apply paint with a small roller for an even finish
Painting with a roller is a great way to get an even finish on your plastic round tubs. It is important to prepare your roller correctly to achieve the best results. Firstly, if you are using water-based paints, give your roller a wash in water, or use mineral spirits if you are using oil-based paint. This will help you achieve a smooth and consistent finish.
Once your roller is prepared, the next step is to load it with paint. A common mistake is to use too much paint, which can cause streakiness and unnecessary splatter. The perfect amount of paint should be just shy of overflowing, and you should be able to see a small amount of the microfibres. If you are unsure, start with less paint and add more as you go. You can also remove excess paint by squeezing it into your roller tray before you start painting.
When you are ready to paint, use moderate pressure and a comfortable grip. Pushing too hard will cause the paint to come off in blobs and will prevent even coverage. Work in a narrow V-shape in the centre of the area you are painting, using light pressure and allowing the roller to do most of the work. Use a vertical zigzag motion to blend the areas, and overlap each stroke by 30-40% for a smooth finish.
If you are finding it difficult to get an even coat, your roller may be overloaded. Try rolling in a W or N pattern to avoid paint lines and streaks. Start from the top and make three downward strokes to form a W, then fill in the empty spaces with up-and-down strokes until the paint is even.
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Seal the tub to protect the paint job
Sealing your plastic round tub is an important step to protect your paint job and ensure its longevity. Here are some detailed instructions to help you seal your freshly painted tub effectively:
First, it is important to choose the right products. Select a sealer that is designed for use on plastic surfaces. Some recommended products include a clear coat, which can be found in both glossy and matte finishes. You can also use a varnish, with gloss varnish offering the most protection. If you're sealing a 3D-printed tub, consider using a product like Plastidip before painting, as it seals any layer lines and helps the paint adhere better. Additionally, consider using a primer designed for plastic surfaces, such as Gripper Primer by Glidden, to ensure the paint sticks to the tub.
Once you have chosen the appropriate products, follow these steps:
- Allow sufficient drying time between coats. Follow the instructions on your paint can for the recommended drying time, which is typically around 30 minutes.
- After applying the final coat of sealer, let the tub sit for at least 24 hours before handling it. This extended drying period ensures that the surface is fully dry and set, reducing the risk of smudges or marks.
- Consider adding an extra layer of protection by sealing the clear coat with a good-quality wax or polish.
- If your tub will be exposed to sunlight, choose a sealer with a UV inhibitor to prevent cracking and peeling over time.
- For a more permanent solution, consider using an automotive clear coat. However, keep in mind that this method requires an airbrush for application.
By following these steps and choosing the right products, you can effectively seal your painted plastic round tub, ensuring that your paint job remains protected and durable.
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Frequently asked questions
As plastic is smooth and non-porous, most paints won't adhere to it. You can sand the tub with fine sandpaper to give the paint something to grip onto. Then, apply a bonding agent and leave it to dry before applying your paint.
Acrylic enamel is the best material for the job. You can buy this in a typical tub or in a spray bottle. If you use a tub of paint, a small roller will help you achieve an even and streak-free finish.
Yes, a primer will help smooth out the surface of your tub and allow your paint to go on more smoothly. It will also help your paint to adhere, which is essential if you want your paint job to be long-lasting.
