This isn’t a common issue for decks that were painted. If stain is applied, the stain is actually absorbed into the wood, altering the shade and appearance of the wood. Since the stain penetrates the wood, it won’t be able to peel. 

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The paint applied to a wooden deck surface is actually placed on the top of the wood. The exposure to sunlight and humidity can cause the painting to begin peeling and cracking. Sometimes, the reason is caused by inadequate surface preparation. If the surface was moist or not well-maintained, the paint would not form a solid bond to the deck’s surface.

The most effective method to handle peeling paint on a surface is completely eliminating any paint and then stains it. In the scenario you gave, we’ll require the removal of the damaged section of the deck, sand down the surface before repainting. Make use of a chemical stripper which is sprayed through the garden sprayer to begin.

Combine the solutions as per the specifics of the manufacturer. After application, you can employ a pressure washer to get rid of the solution. If you don’t own one, many home improvement shops and rental centers provide daily rental rates.

Maintain the nozzle at the fan level so as not to harm the wood by using too much pressure. Keep the nozzle near the surface, and work on each section one at a time. You’ll see the paint begin to evaporate. We now wait for the paint to completely dry. It will likely take several days. 

Keep in mind that applying paint on slightly damp surfaces can cause the peeling of paint to continue. After you’ve confirmed that the wood is dry, it’s appropriate to begin sanding. The power sander is also the best. With sandpaper of 80 grit, move the sander in line with the grain direction on the wood. 

As we don’t have any information about the date of your deck, we’ll assume that you are sanding wood treated with pressure. Make sure you wear a safety face mask to ensure you’re not breathing in hazardous chemicals. Since all surfaces are smooth, you can remove all dust from the surface using a broom or soft cloths like the old T-shirt.

It’s time to paint. Utilize a long-handled paintbrush or roller and move your strokes in line with lines of wood. Make sure to avoid overlapping strokes of the brush by painting one board at one time. It may take several coats since we’ve removed the wood.