
Painting the inside of your hot tub can be a great way to give it a new lease of life, especially if it has accumulated cracks or other damage over time. Before painting, it is important to ensure that your hot tub is completely empty of water and that the surface has been sanded and cleaned. You may also need to remove any existing top coat or gloss by gently sanding the surface with fine sandpaper. Once the surface is prepared, you can mix your paint and apply it using a brush or roller, working from the bottom up and allowing enough time for the paint to dry before adding additional coats.
| Characteristics | Values |
|---|---|
| Preparation | Clean the hot tub thoroughly, removing any gloss or top coat. |
| Use a strong degreaser/cleaner, such as Tri-sodium Phosphate (TSP) or a bleach solution. | |
| Rinse and dry the hot tub completely. | |
| Sand the surface with fine-grit sandpaper, especially if the surface is composite or acrylic. | |
| Rinse and dry again to remove any dust. | |
| Prime the surface with a suitable primer and allow it to dry. | |
| Paint Type | Use a paint meant for restoring old decking or a potable water tank lining product. |
| Epoxy can be used to seal cracks, but it may not withstand UV exposure and is not tintable. | |
| Sherwin Williams marine enamel is suggested but may not work due to constant heat. | |
| Painting Technique | Use a brush or roller pad to apply paint evenly and uniformly, starting from the bottom and working towards the rim. |
| Allow the paint to dry before adding another coat. | |
| Use a new roller pad and tray for each coat. | |
| Let the final coat dry for at least 24 hours or up to three days before refilling the hot tub with water. |
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What You'll Learn

Preparing the surface
Firstly, ensure that the hot tub is empty and free of any water. This is an important step as you don't want any water to interfere with the painting process or dilute the paint. Use a wet/dry vacuum to ensure that all water is removed from the tub.
Next, clean the hot tub thoroughly. Remove any dirt, debris, or residue that may be present. You can use a strong degreaser or cleaner, such as Tri-sodium Phosphate (TSP) or a bleach solution. Apply the cleaning solution and let it sit for a while before scrubbing it with a long-handled brush. Rinse the tub with water to remove any residue from the cleaning solution.
Once the hot tub is clean and dry, it's time to sand the surfaces. Sanding will create a rough surface that will help the paint adhere better. Use fine-grit sandpaper and sand in the direction of the wood grain if the surface is textured. After sanding, rinse the tub again to remove any dust or debris created during the sanding process.
If your hot tub is made of fiberglass, gelcoat, or acrylic, you will need to rough sand it prior to painting for extra adhesion. Use 100-grit sandpaper for this step.
After sanding, it is important to prime the surface. Use a stain-blocking exterior latex primer and apply it evenly to the entire surface. Allow the primer to dry completely before proceeding to the next step.
By following these steps, you will have properly prepared the surface of your hot tub for painting, ensuring a smooth and successful painting process.
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Choosing the right paint
Firstly, it is important to consider the type of hot tub you have. Most hot tubs are made with acrylic shells, while some older models may be constructed from wood or composite materials. The surface material will determine the type of paint you can use. For example, if you have a wooden hot tub, you will need to use a paint specifically designed for wood, such as a stain or exterior paint.
If you have an acrylic hot tub, you will need to choose a paint that can adhere to this surface. Some sources suggest using a "refinishing" kit designed for small sections, as regular paint may not adhere properly and could peel off over time. It is also recommended to rough-sand acrylic surfaces with sandpaper before painting to create a better bond between the surface and the paint.
Additionally, the paint you choose should be able to withstand constant heat and water exposure without peeling or fading. One product mentioned in this context is Sherwin Williams Marine Enamel, which may be suitable due to its marine application, although some users have expressed concerns about its compatibility with the constant heat of a hot tub. Another product suggested is SherPlate 600, a potable water tank liner coating that can withstand dry heat up to 121°C (250°F). However, it is important to note that this product may require a specialised application process and may not be suitable for acrylic surfaces.
When choosing a paint colour, it is worth considering that some paints, especially epoxies, do not handle UV exposure well and may chalk and fade over time. Therefore, opting for a tinted epoxy may not be the best choice if the painted surface will be exposed to direct sunlight.
Finally, always remember to check with the manufacturer before painting your hot tub, as it may void any warranty.
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Painting techniques
Painting the inside of your hot tub can be a great way to cover up cracks or damage, but it requires careful preparation. Firstly, ensure that your hot tub is empty of water. Drain the water completely and use a wet/dry vacuum to remove any remaining water. Next, you'll need to clean the tub thoroughly. Use a strong degreaser/cleaner, such as Tri-sodium Phosphate (TSP) or a bleach solution, and scrub the tub with a long-handled brush. Rinse and dry the tub after cleaning.
Once the tub is clean and dry, you'll need to sand the surfaces with fine-grit sandpaper. This will help create a rough surface for the paint to adhere to. If your tub is made of fiberglass, gelcoat, or acrylic, be sure to rough sand it before acid washing for extra adhesion. After sanding, rinse the tub again to remove any dust.
Before painting, you may need to apply a primer, especially if your tub is made of composite materials. Choose a stain-blocking exterior latex primer and allow it to dry completely before proceeding to the next step.
Now it's time to mix your paint. Depending on the type of paint you're using, you may need to follow specific instructions for mixing. For example, if you're using a two-part paint system, you'll need to mix only half of each bottle for each coat. Wear disposable gloves and pour the paint into a plastic pail, following the manufacturer's instructions for mixing.
Finally, you can start applying the paint to the interior of your hot tub. You can use a paintbrush or a paint roller for this step. Start from the bottom and work your way up to the rim, ensuring that your strokes are even and overlapping. If using a paintbrush, cut in any corners or around jets, drains, and chrome. Allow the first coat of paint to dry completely before applying the second coat. Use a new roller pad and tray for the second coat.
Let the final coat of paint dry for at least 24 hours before refilling your hot tub with water. It's important to follow the manufacturer's instructions for curing time, as it can take up to three days for the paint to fully cure.
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Drying and curing
Drying Time Between Coats
After applying the first coat of paint, it's crucial to allow ample drying time before proceeding with the second coat. The paint should dry to the touch within 3 to 4 hours. However, it is advisable to wait 24 hours before applying the second coat to ensure the first coat has thoroughly dried. This extended drying time helps prevent issues like paint peeling or an uneven finish.
Drying Time After Final Coat
Once you've applied the final coat of paint, it's essential to allow sufficient drying time before refilling the hot tub with water. The paint typically requires around 3 days to cure completely. During this period, the paint hardens and reaches its maximum durability. Avoid rushing this process, as adding water too soon can compromise the paint's adhesion and longevity.
Environmental Factors Affecting Drying and Curing
Temperature plays a significant role in the drying and curing process. Aim to maintain a temperature between 75° and 80° during application and curing. Temperatures below 70° will prolong the curing process, causing the paint to take longer to dry and cure. Additionally, be mindful of rain during the curing period. If it rains before the 3-day curing period is complete, wait an extra day for the paint to fully cure before refilling the hot tub.
Preparing for Refilling
Before refilling your hot tub with water, ensure that all painting equipment and protective gear are removed from the area. Check that the paint is completely dry and cured by touching it gently to see if it feels hardened and no longer tacky. Once you're confident that the paint is fully cured, you can proceed with refilling the hot tub. Refer to the manufacturer's instructions for the recommended water level and any specific guidelines for restarting the hot tub's systems.
Post-Curing Maintenance
After the paint has cured and the hot tub has been refilled, it's important to maintain proper water chemistry to protect the paint and ensure optimal water quality. Follow standard hot tub maintenance procedures, including regular testing and adjustment of pH and sanitizer levels. Additionally, establish a routine cleaning schedule to prevent the buildup of dirt and grime, which can impact the paint's appearance and longevity.
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Maintenance
Maintaining your hot tub is crucial to ensure its longevity and optimal performance. Here are some detailed instructions for the maintenance of your hot tub, specifically focusing on the painted interior:
- Regular Cleaning: Keep your hot tub water clean and clear by regularly testing and adjusting the water chemistry. Use appropriate sanitizers and shock treatments to prevent the growth of algae and bacteria. Change the water completely from time to time to ensure a thorough refresh.
- Surface Maintenance: Inspect the painted interior surface for any signs of wear, tear, or chipping. If you notice any minor scratches or chips, promptly sand the affected area with fine-grit sandpaper to smooth it out. Remove any gloss or topcoat by gently sanding the surface, always following the direction of the wood grain if applicable.
- Re-painting: If the interior paint starts to fade or crack over time, you may need to re-paint it. Ensure the hot tub is completely empty and dry before starting. Follow the steps outlined in the previous sections, including surface preparation, priming, and applying the paint coats.
- Mold and Stain Removal: Regularly inspect for mold or stains, especially in areas like hot tub pillows or other surfaces that come into direct contact with water or users. Use appropriate cleaning solutions and techniques to remove mold and stains effectively.
- Hot Tub Equipment: Maintain the hot tub equipment, such as jets, pumps, and the blower, in good working condition. Refer to the manufacturer's guidelines for specific instructions on maintaining and troubleshooting these components.
- Warranty Considerations: Before performing any maintenance or modifications, including painting, always check with the manufacturer to ensure you do not void any existing warranties. Some manufacturers may provide specific care instructions or recommended products for maintaining the interior paint.
Remember that proper maintenance of your hot tub's painted interior will not only enhance its aesthetic appeal but also contribute to a safe and enjoyable experience for you and your guests.
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Frequently asked questions
First, make sure there is no water in your hot tub. Then, sand the surfaces of your hot tub with sandpaper. Next, mix a gallon of water with half muriatic pool acid and wash the inside surface with it. Rinse the area well and let the hot tub dry off completely.
You can use a two-part paint system that requires two coats to be applied. You can also use a paint that is meant for restoring old decking, which can be found in the deck stain section of your hardware store. Other paint suggestions include Sherwin Williams marine enamel and SherPlate 600.
You can use a brush or a paint roller to apply the paint. Start at the bottom floor of the hot tub and work your way up to the rim, applying the paint in even and overlapping strokes. Make sure not to apply too thick of a coat to avoid runs.
Allow at least 24 hours for the paint to dry before adding the second coat. After applying the second coat, let the paint dry for three days before putting water in your hot tub.










































