How to Apply Deck Sealer: A Beginner’s Guide

Imagine this – you’ve got a gorgeous deck, perfectly placed to catch the afternoon sun. You’ve spent countless hours staining and finishing it to perfection. But without the right protection, the harsh British weather can quickly undo all your hard work. That’s where deck sealer comes in. It’s like a raincoat for your deck, shielding it from the elements and ensuring it stays looking its best for years to come.

If you’re a DIY enthusiast ready to take on this task, let’s explore the process of applying deck sealer, providing you with expert tips and best practices to ensure your deck remains a source of pride and enjoyment.

What is a Deck Sealer?

Put simply, a deck sealer is a clear protective coating that forms a barrier on the surface of your deck. It helps repel water, resist UV damage, and prevent stains from spills and general wear and tear. Think of it as an invisible shield, keeping your deck looking fresh and vibrant even after enduring the harshest weather conditions.

That being said, if you’re using our resistant, best selling composite decking in the UK, you don’t need sealant – it’s already resistant enough on its own. Just saying!

Tools and Materials Needed

Before we roll up our sleeves, let’s gather our tools and materials. You’ll need:

• A stiff-bristled brush or broom
• Deck cleaner and brightener
• A pressure washer (optional)
• Sandpaper (medium grit)
• Drop cloths
• Paintbrushes, rollers, or a sprayer
• Deck sealer
• Protective gloves and eyewear

Preparing Your Deck for Sealing

The key to a successful sealing job is proper preparation, so let’s make sure your deck is clean, dry, and ready to absorb that protective coating.

Cleaning the Deck

First, clear off all the furniture, planters, and anything else cluttering up your deck. Then, give it a good sweep to get rid of any loose debris. Next, apply a deck cleaner and brightener according to the manufacturer’s instructions. If your deck is looking particularly grimy, you might need to bring out the big guns – a pressure washer.

Repairing the Deck

Once the deck is clean, take a closer look. Are there any loose or damaged boards that need attention? Any nails or screws sticking out? Now’s the time to fix those up, ensuring a smooth and safe surface.

Sanding the Deck

If you’ve got an older deck, or if there’s any peeling stain or sealant, you might want to give it a light sanding; this helps the new sealer adhere properly and gives you a more even finish.

Choosing the Right Deck Sealer

Not all sealers are created equal, so choose one that’s designed for your type of wood and the level of protection you need. For the best results, look for a high-quality, water-based sealer that offers UV protection and mildew resistance.

Applying the Deck Sealer

Now, let’s get down to business!

Starting with the Railings and Edges

Begin by applying the sealer to the railings, posts, and any vertical surfaces. These areas are more prone to water damage, so it’s important to give them a good coat. Use a brush to get into all those nooks and crannies.

Sealing the Main Deck Surface

Once the railings are done, it’s time to tackle the main deck surface. You can use a brush, roller, or sprayer, depending on your preference and the size of your deck. Apply the sealer evenly, working with the grain of the wood, and avoid over-application. Remember, multiple thin coats are better than one thick one.

Cleaning Up

Clean your tools immediately after use, following the manufacturer’s instructions for your chosen sealer.

Drying and Curing

Allow the sealer to dry completely before replacing any furniture or walking on the deck. The drying time will vary depending on the type of sealer and the weather, so be sure to check the label for specific instructions.

Common Mistakes to Avoid

Even with the best intentions, it’s easy to make mistakes when sealing your deck. Here are a few common pitfalls to watch out for:

Poor Surface Preparation

Skipping the cleaning and sanding steps can lead to uneven application and poor adhesion.

Over-application of Sealer

Applying too much sealer can result in a sticky, tacky finish that attracts dirt and debris.

Sealing in Direct Sunlight

The heat from direct sunlight can cause the sealer to dry too quickly, leading to an uneven finish.

Ignoring Weather Conditions

Avoid applying sealer in extreme heat, humidity, or when rain is expected.

Not Allowing Sufficient Drying Time

Don’t rush the process! Ensure each coat is completely dry before applying the next or replacing any furniture.

Final Thoughts

Sealing your deck is a worthwhile investment in its longevity and beauty, but remember, even with proper sealing, regular maintenance is key to a healthy deck. Keep an eye out for any signs of wear and tear, such as cracking or splintering, and address them promptly. And if you’re dealing with persistent issues, check out our guide on common problems with composite decking and how to fix them for valuable troubleshooting tips.