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Applying a sealer or topcoat after staining wood is highly recommended, though not always strictly required. A sealer protects the wood from moisture, UV rays, and weather-related issues, which is especially important for outdoor surfaces like decks and fences. It also enhances the stain's durability, prevents fading over time, and gives the wood a cleaner, more professional-looking finish. For some indoor applications, a sealer may not be necessary, depending on the type of stain used and the level of protection needed. It's always best to check the stain manufacturer's recommendations and consider the wood's intended use and exposure when deciding whether to apply a sealer.

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.

Manufacturers use a different process and formula for exterior paint versus interior. The exterior formula has to withstand elements like temperature, UV lighting, moisture, wind, and debris. Interior paint doesn’t need to be as tough, only exposed to dust, scratches, dents, scuff marks, and the like.

On most untreated wood fences, there is no need to sand before treating. You typically only need to sand if there’s an old coat of paint or stain on your fence. If you do need to sand off a previous paint or protective coating (like an old stain or sealant), use medium-grit sandpaper.