Does Polyurethane Make Wood Waterproof? Nope
In this quick guide, we’re going to delve into an intriguing question that pops up often among woodworking aficionados: does polyurethane make wood waterproof?
You might’ve noticed polyurethane appearing as a go-to in countless wood-finishing projects. But does it really make wood waterproof, or is it more about water resistance? Let’s find out!
⇒ TLDR:
- Polyurethane offers a decent shield, but it doesn’t make wood fully waterproof.
Is Polyurethane Good for Waterproofing Wood?
Polyurethane makes wood more resistant to water, but it doesn’t make it waterproof. Even if you apply multiple coats, the result is the same.
This is an important distinction: being water-resistant isn’t the same as being waterproof.
A water-resistant material can resist the penetration of water to some degree but not entirely. A waterproof material is impervious to water, no matter how much time it spends in contact with it.
Polyurethane can keep your wood dry during everyday events. These include accidental spills or occasional light rain.
But if your wood is exposed to water for a long time, it won’t stay completely dry. Polyurethane simply isn’t the best solution for prolonged water exposure.
For that level of protection, you’ll need something more heavy-duty, like a specific marine-grade finish.
Polyurethane is a fantastic finish for a lot of projects, but if your wooden piece is going to be frequently exposed to water, it might be worth exploring other options.
As a quick reminder, in its natural state, wood is not waterproof.
Key Points to Keep in Mind When Using Polyurethane on Wood
One layer of polyurethane is not enough because it has tiny holes.
You should apply at least three layers of polyurethane for the best protection.
Polyurethane can get scratched and worn down over time, even from just walking on it.
Polyurethane becomes less effective as time passes due to natural wear and tear and wood movements. That’s why you should reapply a new coating regularly.
Shaking a can of polyurethane can cause air bubbles, leading to bumps in the finish. So, avoid shaking the can!
Enjoy your DIY projects!
