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Wood stain is not flammable after it dries. The solvent in wood stain is what causes the liquid form to be highly flammable, but the stain drying process involves the solvents dissolving, which leaves behind a non-flammable product on your wood project. Wood stain is, however, flammable before you apply it, so you should always store partially full cans and used wood stain rags away from sources of heat and open flames.

Waterproof paint creates a barrier to hold back moisture, but it doesn’t eliminate the source of the water. If you hire a basement waterproofing contractor, many will tell you that waterproof paint is only a temporary solution. On average, you can expect it to last from six months to two years in a wet basement before deteriorating.

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.

Yes, it is generally a very good idea to seal your deck after pressure washing. Power washing removes not only dirt and debris but also a thin layer of wood, leaving the surface exposed and more susceptible to weathering. Sealing is almost always needed after this process. After a general cleaning, sealing isn't automatically necessary if the existing sealant is still intact. You can test the surface by placing a few drops of water on it. If the water beads up, the sealant is working. If it soaks into the wood, it's time to apply a new sealant. If it has been a few years, it's wise to remove the old sealant, wash the deck, and reseal for maximum protection.