Tip: Oil- or water-based urethane waterproofing sealer is best for waterproofing existing hardwood flooring, since it preserves the wood's finish. Use a wool mop to spread urethane waterproofing sealer instead of a paint roller.
If you already have natural wood floors installed in your home, you won't be able to make them completely waterproof. However, you can use the right treatment to make your flooring more water resistant, with the result that spilled liquids don't have to be dealt with immediately.
Wood flooring requires special care because it's porous and susceptible to damage from water and moisture. To prevent this, use a waterproof sealer like PolySeal® Floor Sealer, or something similar. It will protect your floors against stains, spills, and other damaging elements.
To seal a wooden floor on a budget, consider using a water-based polyurethane sealant. This type of sealant is cost-effective and provides good protection against moisture and wear. Apply multiple thin coats for optimal coverage and durability. For more cost-saving woodworking solutions, check out my Quora Profile.
Can Water Seal be used on wood? Applying Water Seal will not damage wood, but the level of waterproofing protection will vary depending on the type of wood being treated. For best results, we would recommend a dedicated preserver to protect exterior timber from rot.
On average, Thompson's water seal will last for about 5 years. Depending on the weather patterns in your area, this deck sealer might need your attention more often. In a rainy state, you might need a fresh coat of water seal for ultimate protection every 2-3 years.
Though many people believe oil-based finishes are more durable, superior technological advancements to water-based finish have been made in the last 40 years that prove water-based finishes last longer and hold their appearance longer. High quality floor finishes of both types can last about 10 years.
If you only have some minor scratches and dings or a dull finish, you might be able to simply buff and add a new coat of varnish. But, even if your floors need a complete makeover, refinishing hardwood is a very manageable and rewarding do-it-yourself job that can save a lot of money.
The foundation to protect hardwood floors lies in applying a high-quality sealant. Think of it as an invisible shield that repels moisture and protects your investment. There are two main types of sealants to consider: Penetrating Sealants: These soak into the wood, creating a water-resistant barrier from within.
Water-based polyurethane is a great choice for a clear, non-yellowing finish that dries quickly. Top brands like Bona Traffic HD and Minwax offer high-quality options for different needs. Proper surface preparation and application techniques are crucial for the best results.
DON'T: Do not use anything with ammonia in it to clean your wood floors. Stay away from wax based products, acrylic finishes, detergents, bleaches, polishes, oil soaps, and vinegar. Instead, get a hardwood cleaning solution (you can pick them up at any big hardware store), spray it on a dust mop and go to town.
Daily: Dry mop floors with a microfiber dusting pad and mop. Clean spills immediately. Weekly: Clean deeper with a vacuum designed for wood floors or use a microfiber spray mop and cleaner formulated for hardwood floors. Monthly: Polish wood floors every 2-6 months for extra shine and protection.
Sealant. Sealant is a popular choice for waterproofing wood, offering long-lasting protection by forming a waterproof barrier on the wood's surface. Sealant is one of the closest options for how to permanently waterproof wood. Unlike oil, sealants provide both strength and protection.
Waterproof hardwood has a real hardwood veneer that's permanently attached to core made of 100% waterproof lamina. It provides the same benefits of authentic hardwood, such as unique beauty, warmth, and unsurpassed comfort and feel.
Water Under Engineered Wood Floor
Most engineered wood flooring has a core that isn't water-resistant and will be damaged if it's soaked in water. Once the core has absorbed enough water, the floor will begin to expand and cupping will occur.
Tip: Oil- or water-based urethane waterproofing sealer is best for waterproofing existing hardwood flooring, since it preserves the wood's finish. Use a wool mop to spread urethane waterproofing sealer instead of a paint roller.
And a quick Google search reveals that a lot of people still recommend using it. But vinegar should not be used as a hardwood floor cleaner because its acidity can lead to etching in the wood's surface.
Oil Finishes
They're a tried and true method of hardwood floor sealing and they're typically much cheaper than water-based polyurethane. The main drawback is that they contain more VOCs and take longer to dry. This can mean that you can't use the floors for days or even weeks.
Varathane Water-Based Clear Gloss Polyurethane
Varathane Water-Based Clear Gloss Polyurethane is a top choice for high-traffic areas. This fast-drying floor varnish is designed to resist scuffs, abrasions, and scratches, making it ideal for busy households or commercial spaces.
Average Cost:
Cost estimates are powered by evolving AI-driven analyses of real homeowner experiences and trusted partner project data across the United States. Hardwood floor refinishing can cost between $600 and $2,000 on average as of 2025, or $3 to $8 per square foot.
Water-based polyurethane has a tendency to interact more with the wood grain, which often necessitates the application of multiple coats to achieve a smooth finish.
Oil-Based Polyurethane: Wait 3 to 7 days before sleeping in the house. Water-Based Polyurethane: Wait 2 to 3 days before sleeping in the house. Natural Oils or Waxes: Wait 2 to 5 days depending on the specific product.
Bona Mega. A water based floor finish with an oxygen-crosslinking polyurethane formula.