
Painting a deck is a great way to improve its appearance and protect the wood from wear and tear, UV rays, and moisture. Before painting a deck that is already painted, it is important to prepare the surface by removing any chipped or peeling paint and filling in any cracks or divots. Once the surface is smooth and clean, you can apply a coat of primer and then the paint colour of your choice. To ensure a consistent colour, it is recommended to use the paint-boxing technique by mixing several cans of paint in a bucket. Depending on the desired finish, you may need to apply two to three coats of paint, allowing sufficient drying time between each coat.
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What You'll Learn
- Preparation is key: sweep, scrape, sand, and repair the deck before painting
- Choose the right paint: consider UV protection, moisture resistance, and durability
- Calculate paint quantity: measure the deck's area and use a paint calculator
- Apply primer: use a brush to reach between deck boards, then a roller for the rest
- Paint application: use a roller, leave 2 days between coats, and apply 2-3 coats

Preparation is key: sweep, scrape, sand, and repair the deck before painting
Painting a deck that is already painted requires a fair amount of preparation. Before you start painting, you'll need to sweep, scrape, sand, and repair the deck to ensure the new paint adheres properly and that your deck is safe and in good condition.
Begin by clearing any objects off the deck. Sweep away dust, dirt, and debris, paying particular attention to paint chips and sawdust that may have accumulated on the deck. You can use a broom for this. After sweeping, use a paint scraper to remove any flaking, chipped, or peeling paint. Apply pressure to the scraper so that it slides under and across the existing paint without damaging the wood underneath.
The next step is to sand the deck. Sanding the deck will smooth out any rough edges and help the new paint adhere better. If your deck is in relatively good shape, you can use sandpaper or a sanding block to manually smooth out the edges. For older decks that are more prone to splinters, it is recommended to rent a power sander to sand the entire deck surface more efficiently.
Once you've finished sweeping, scraping, and sanding, it's important to inspect the deck for any damage. Look for loose boards, protruding nails, chips, divots, or cracks. Use a hammer and nails to fix any loose boards and level out any nails that are sticking up. For chips, divots, and small cracks, you can use exterior wood putty to fill them in. However, if any of the boards are badly damaged, it's best to replace the entire board to prevent future issues.
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Choose the right paint: consider UV protection, moisture resistance, and durability
When choosing paint for your deck, it is important to consider UV protection, moisture resistance, and durability.
Paint is an excellent option for protecting your deck from harmful UV rays, which can damage wood fibres and make the deck more prone to cracking and warping. Paint lays down a thick, tough coat that penetrates the wood's underlying cellular structure, providing a protective barrier against UV radiation.
Additionally, paint offers superior moisture resistance compared to stains. By sealing the deck against moisture, paint helps prevent water damage and protects the wood from the elements.
When selecting paint, opt for a high-quality product that is specifically designed for exterior use and can withstand varying weather conditions. Look for paint that is long-lasting and durable, ensuring it can stand up to regular wear and tear.
Proper preparation of the deck is also crucial to ensure the paint adheres well and provides maximum protection. This includes scraping off any peeling or chipped paint, sanding down glossy areas, and filling any cracks or divots with wood putty.
Finally, consider the colour and finish of the paint. Choose a colour that complements your home and yard, and decide if you want a glossy or matte finish. You may also want to mix an anti-skid additive into the paint to provide a better grip and prevent slips.
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Calculate paint quantity: measure the deck's area and use a paint calculator
To calculate the amount of paint you need to paint a deck that is already painted, you must first determine the area of the deck in square feet. Measure the length and width of each section of the deck and write these numbers down. Multiply the length of each section by its width to get the square footage of that section. If there are multiple sections, add the square footage of each section together to get the total square footage of the deck.
Next, determine the number of coats of paint you will need. Most decks require two coats of paint.
Then, determine the yield of the paint, which is how many square feet one gallon of paint can cover. Paint will usually be applied at 300 to 400 square feet per gallon, but this may vary depending on the brand of paint used and whether the wood is bare or already painted. If the wood is bare, it will soak up more paint, and you will get closer to 300 square feet of coverage per gallon.
Finally, calculate the amount of paint needed in gallons by multiplying the area of the deck by the number of coats of paint, and then dividing that number by the yield of the paint. For example, if your deck is 700 square feet and you need two coats of paint, you will need 4 gallons of paint (2 gallons for the first coat and 2 gallons for the second). It is recommended to round up to the nearest gallon and purchase slightly more paint than you need to ensure you have enough for touch-ups and repairs.
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Apply primer: use a brush to reach between deck boards, then a roller for the rest
Before applying primer, it is important to prepare the deck. This includes checking for visible damage, such as cracked deck boards, chips, or gouges in the wood, and patching or repairing any issues. If the deck has been previously painted, remove any peeling or chipped paint, as this will prevent the new paint from bonding. Use a paint scraper to gently remove the old paint, being careful not to damage the wood underneath. After scraping, use sandpaper or a sanding block to smooth rough edges and ensure the surface is ready for priming.
Now, let's move on to the primer application process:
Begin by using a paintbrush to reach between the deck boards. Dip the brush into the primer and force it between the boards, priming every seam. Also, prime the sides of the deck boards and any areas that a roller cannot easily access. This brushwork ensures that the primer is applied thoroughly to all the nooks and crannies of the deck.
Next, use a roller for the larger, more accessible areas of the deck. Pour the primer into a bucket and attach a roller cover to a telescoping rod. Lightly press the roller into the primer, then roll it out on a screen to remove any excess. Move the roller to the deck and cover the boards with primer, working backward. This will help you maintain a consistent and even application.
Allow the primer to dry for about 1 to 4 hours. The drying time may vary depending on the weather conditions and the specific primer product used. Always check the manufacturer's instructions for the recommended drying time.
By using a combination of a brush and a roller, you can effectively apply primer to the entire deck, ensuring a smooth and durable finish. This step is crucial in preparing your deck for the new paint application.
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Paint application: use a roller, leave 2 days between coats, and apply 2-3 coats
When it comes to painting a deck that is already painted, the paint application process is crucial for achieving a smooth and uniform finish. Here are some detailed instructions for applying paint to your deck:
Paint Application:
Before starting, ensure you have the necessary tools, including a roller, paintbrush, and primer. It is recommended to use a roller for efficient and even paint distribution. Start by preparing the paint. If you are using multiple cans of paint, mix them in a clean 5-gallon bucket to ensure colour consistency throughout the project.
Next, begin the priming process. Use a paintbrush to apply primer to the areas that the roller cannot easily reach, such as between deck boards and along their sides. Then, pour the primer into a bucket and use a roller to apply it to the rest of the deck. Allow the primer to dry for about 1 to 4 hours, depending on the product you are using and the weather conditions.
Once the primer is dry, it's time to apply the paint. Using your roller, start painting the deck, working backward from where you started priming. Apply the paint evenly and smoothly, ensuring you cover all areas of the deck. Leave the paint to dry for at least 2 days between coats. It is recommended to apply 2-3 coats of paint to the deck for a durable and consistent finish.
By following these instructions and allowing sufficient drying time between coats, you will achieve a high-quality and long-lasting paint job on your deck. Remember to take your time, work in a well-ventilated area, and protect any adjacent surfaces and vegetation with drop cloths or coverings.
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