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The best way to protect a deck is to prevent damage from UV light, water, mold, mildew, insects, and abrasive cleaning methods. Sweep regularly to prevent debris that hides bugs and traps moisture that can result in mold or mildew growth. Use a deck cleaner once a year to remove algae, mold, and mildew. Avoid using pressure washers on high, as they can damage the wood. Applying a deck sealant can protect the wood from UV and water damage, and adding shade can also reduce sunlight damage.

Satin paint is generally considered a better choice for woodwork—including trim, baseboards, cabinets, and doors—than flatter finishes like eggshell or matte. Its soft sheen enhances architectural details and stands up well to frequent cleaning and daily wear. Compared to eggshell and matte finishes, satin is more durable for high-touch areas because it is less porous and doesn't absorb dirt as easily. Matte finishes, in particular, are prone to scuffs and are harder to clean, making them less practical for surfaces like doors and cabinets.

There’s no single paint that’s the most waterproof. Instead, there are several types of waterproof and water-resistant paints that suit different purposes. Epoxy paint, for instance, is commonly used to provide a waterproof coating to floors and decks. Masonry paint is an excellent choice for exterior walls. Meanwhile, there are waterproof acrylic paints that can be used for interior and exterior walls. It’s more about choosing the best type for what you’re painting instead of the most waterproof paint overall.

An exterior paint job typically lasts between 5 and 10 years, though this can range from 3 to 17 years depending on several factors. The longevity is influenced by the quality of the paint and primer, the quality of the application, the local climate, and the type of surface being painted. For example, paint on wood siding may need to be redone every 3 to 7 years, while painted brick can last up to 17 years. Aluminum siding often needs repainting every 5 years.