Bothbest is a FSC certified bamboo factory based in China starting the manufacturing since 2001, mainly supplying bamboo flooring, bamboo decking and bamboo plywood.
Merbau is one of the most beloved timbers in the world of outdoor construction, and for good reason. Known for its distinct reddish-brown hue and exceptional durability, this Southeast Asian hardwood is a staple for high-end decks, boardwalks, and poolside retreats. It is naturally resistant to termites and rot, and it carries a high fire-resistance rating, making it a practical choice for a variety of climates.
However, the very thing that makes Merbau beautiful—its rich, deep pigment—is also what makes its initial maintenance a bit of a challenge. Many homeowners install a Merbau deck and are surprised when the first rainstorm turns their patio into a sea of red "bleeding" tannins. To keep a Merbau deck looking like it was installed yesterday, you need to understand the science of the timber and follow a specific maintenance protocol that differs from standard softwoods.
The first and most important secret to Merbau maintenance is managing the tannins. Merbau is exceptionally high in natural tannins, which are organic water-soluble compounds. When the timber is new, moisture will draw these tannins to the surface, where they will wash off. This is often referred to as "bleeding."
If your deck is near light-colored pavers, render, or a pool, this red liquid can cause stubborn stains. The professional secret to handling this is pre-weathering. Before you apply any oil or sealer, the deck needs to be "purged" of these excess tannins.
The Traditional Method: Let the deck sit through several heavy rain cycles.
The Professional Shortcut: Use a high-quality deck wash containing oxalic acid. This opens the pores of the timber and helps flush out the tannins in a controlled manner. Scrubbing the deck and rinsing it thoroughly several times before sealing will prevent that messy bleeding from happening later, under your expensive finish.
A common mistake is sealing Merbau too early or too late. If you seal it immediately after installation without washing it, you trap the tannins inside. Eventually, they will try to escape, causing the oil to lift or flake.
Conversely, if you leave Merbau unsealed for too long (more than 6–8 weeks of full sun), the UV rays will begin to "silver" the timber. While some people enjoy the weathered gray look, the goal of "looking new" requires catching the timber while it still has its natural oils. The sweet spot is usually after 2 to 4 weeks of weathering and a thorough chemical clean. Once the water no longer turns red when you rinse the deck, and the wood is completely dry, it is ready for its first coat.
When it comes to Merbau, the type of oil you choose dictates how often you will be out there working.
Solvent-Based Oils: These are the traditional choice. They penetrate deep into the dense grain of the Merbau. They offer a very traditional, "wet" look that emphasizes the grain. However, they tend to darken the wood significantly over time and can be prone to "skinning" if applied too thickly.
Water-Based Oils (Acrylates): Modern water-based oils have improved significantly. They sit slightly closer to the surface but provide superior UV protection. They tend to hold the "red" color longer without turning the deck almost black, which can happen with repeated solvent oiling.
The Secret: Use a tinted oil. Clear oils offer almost zero UV protection. Think of a tinted oil as sunscreen for your deck. The pigments in the tint block the UV rays from bleaching the wood fibers. For Merbau, choose a tint specifically labeled "Merbau" or "Dark Oak" to complement the natural tones of the wood.
Because Merbau is so dense, it cannot absorb large amounts of oil at once. A major regret for many homeowners is applying a thick, heavy coat of oil, thinking it will provide better protection. Instead, the oil sits on top, stays tacky, collects dirt, and eventually peels.
The secret to a professional finish is applying two very thin coats. Use a high-quality lamb’s wool applicator or a specialized deck brush. After applying a coat, wait 10 to 15 minutes and then use a dry rag or a clean applicator to "back-wipe" any excess oil that hasn't been absorbed. This ensures the oil is in the wood, not on it. This technique prevents the "plastic" look and keeps the deck feeling like natural timber underfoot.
If you’ve inherited a Merbau deck that has already turned gray, don't panic. One of the best secrets of hardwood is that the graying is only microns deep.
To bring back the "new" look, you don't necessarily need a heavy-duty sander. A wood "brightener" or "restorer" containing citric or oxalic acid can work wonders. When applied to gray Merbau, these chemicals react with the weathered fibers and the iron stains, chemically lifting the gray and revealing the fresh reddish-brown timber underneath. It’s a bit like a chemical peel for your deck. Once brightened and rinsed, the deck will look remarkably fresh and ready for oiling.
Maintenance isn't just about the top surface. The ends of the Merbau boards are the most vulnerable part of the deck. The end-grain is like a bundle of straws; it sucks up moisture much faster than the face of the board. This leads to "end-checking" or splitting.
Whenever you or your carpenter makes a cut during installation or repair, the secret is to apply a wax-based end-grain sealer immediately. Even on an old deck, if you notice the ends starting to split, cleaning them out and applying a bit of sealer can stop the cracks from traveling down the length of the board.
You wouldn't let your car go a year without a wash, and your deck is no different. Dust, bird droppings, and leaves all contain acids and tannins that can eat away at your deck oil.
The secret to longevity is a soft wash every three months. Avoid using a high-pressure power washer at close range. The pressure can "fuzz" the fibers of the Merbau, making it feel rough and stripping away the protective oil. Instead, use a garden hose with a spray nozzle and a soft-bristle broom. A quick scrub with a very mild detergent will remove the surface grit that acts like sandpaper every time you walk across the deck.
A deck is only as healthy as its substructure. One of the "unseen" maintenance secrets for Merbau is ensuring the area beneath the deck is dry and well-ventilated.
If moisture is trapped under the 3050 bamboo decking, it creates a "vapor drive." The moisture tries to move through the Merbau boards to escape, which can cause the boards to cup or the oil to bubble. Ensure that your deck has adequate gapping (at least 4-5mm) between the boards. If you notice the wood stays damp for days after a rain, check that your drainage isn't blocked by leaf litter. A deck that can breathe from underneath will hold its finish much longer than one that is constantly humid.
Before you commit to re-oiling the entire deck, always perform a water bead test. Drop a few tablespoons of water on a high-traffic area of the deck.
If the water beads up: Your oil is still doing its job. Just give it a clean.
If the water soaks in and darkens the wood: The protection has worn thin, and it’s time for a maintenance coat.
Oiling a deck that doesn't need it will only lead to a sticky, over-built surface. The secret to a deck that always looks new is applying oil just as the old layer begins to fade, but before the wood starts to turn gray.
While this might sound like a lot of work, Merbau rewards you like few other timbers can. It has a natural "glow" and a structural density that feels incredibly solid underfoot. Unlike softwoods that feel springy or composites that can feel like plastic, Merbau is a premium architectural material.
By understanding the tannin cycle, choosing the right tinted oils, and maintaining airflow, you can keep that deep, luxurious wine-red color for decades. Merbau isn't a "set and forget" material, but with these maintenance secrets, the work you do will be minimal, and the aesthetic payoff will be the envy of the neighborhood. A well-maintained Merbau 2900 bamboo decking doesn't just look new; it adds significant value to a home, serving as a timeless centerpiece for outdoor living.
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