Which decking oil should you choose?
A wooden deck is a lovely place to spend time in summer. Without care, though, the wood can turn grey, rough and dull. Choosing a suitable deck oil helps preserve its appearance and lifespan. This guide explains clear and pigmented oils, matching the product to your wood and what to look for on the label.
What does deck oil actually do?
Deck oil penetrates the wood fibres rather than forming a lacquer-like film on the surface. It suits decking exposed to foot traffic, rain and sunlight. The oil nourishes the wood, makes it water-repellent and helps keep it supple, reducing drying and cracking.
The oil performs three tasks at once. It protects against water, so rain beads off instead of penetrating and providing a breeding ground for rot and algae. It protects against the sun's rays, which otherwise degrade the wood's surface and turn it grey. And it enhances the wood's natural colour and grain, making the deck look rich and vibrant. How well it handles each of these three tasks largely depends on whether the oil is clear or pigmented, and whether it is suitable for the type of wood you have.
Clear or pigmented deck oil?
Clear and pigmented oils differ in both colour and protection. Pigmented oil contains particles that help block UV rays. Clear oil has fewer of these protective pigments, so the wood is more likely to turn grey over time.
When should you choose clear deck oil?
Clear deck oil brings out the wood's natural colour and grain without adding a tint. It suits attractive wood whose character you want to show, provided you are prepared to maintain it more often. A completely clear oil offers less protection from sunlight, so more frequent treatment is needed to preserve the colour.
When should you choose pigmented deck oil?
Pigmented oil adds a light tint, brings out the wood's warmth and provides better UV protection. For most decks, this keeps the colour for longer and reduces how often oiling is needed. Choose a shade close to the wood's natural colour. More pigment improves UV protection but also covers more of the grain.
Choose an oil for your wood species
Dense hardwood and soft pine absorb oil differently, so a universal product may not suit both. Dense wood needs an oil that can penetrate it. An unsuitable, overly thick oil can stay on the surface as a sticky film that collects dirt. Match the product to the wood species and follow the label.
| Wood species | Recommended oil | Note |
|---|---|---|
| Pressure-treated pine and spruce | Deck oil for pressure-treated wood, preferably pigmented | Soft, absorbent wood; a brown or teak tint helps preserve the colour and slow greying |
| Larch | Oil for softwood or universal wood oil with good penetration | A lightly pigmented oil gives a more even finish across larch's colour variations |
| Hardwood (ipé, teak, cumaru) | Low-viscosity hardwood oil for tropical wood species | Dense structure requires low viscosity so the oil can penetrate instead of sitting on top |
If the can specifies which wood types the oil is intended for, follow that. If in doubt, an oil for the specific wood type is always a safer choice than a universal oil that claims to do it all.
Oil types: what should you look for?
After choosing a clear or pigmented oil suited to your wood, check these other features:
- UV filter. Always choose an oil with a UV filter and preferably some pigment. This is the single factor that matters most for how long the deck retains its colour.
- Water-based or oil-based. Water-based oils dry faster, smell less, and are easier to clean up. Oil-based oils often penetrate deeper and can provide a richness that many people appreciate. Both types work well for a deck.
- Good penetration. A good deck oil should soak into the wood, not form a layer on top. If the oil appears shiny and sticky, it is either too thick for the wood or applied too thickly.
- Durability and maintenance. Softwoods like larch and pressure-treated pine typically benefit from treatment once or twice a year, while a good oil on hardwood often lasts longer between treatments.
How much oil do you need?
As a guide, 1 litre of deck oil covers about 10 to 20 square metres, depending on how dry and absorbent the wood is. Grey, rough or unplaned boards take more than smooth, well-maintained wood. Measure the area and allow extra if the deck has been untreated for some time, so you can finish in one session and avoid colour differences between sections.
If you want to know exactly how to apply the oil correctly, how many coats to apply, and how to prepare the wood, you'll find the full procedure in our guide to oiling a deck. This guide is about choosing the right oil, while the actual work is described step-by-step there.
Oil needs sound wood underneath
Deck oil alone cannot restore a grey, weathered board. The grey surface is a thin layer of damaged wood fibres, not simply dirt. Oil applied over that layer cannot penetrate properly, leaving a patchy, short-lived finish because it cannot reach the sound wood underneath.
If the deck is grey, rough or covered in raised fibres, sand it first. This removes the weathered layer and exposes fresh wood that can absorb the oil, allowing a rich, even finish. To restore a grey deck's colour, we can take care of the hard work with professional balcony and deck sanding, leaving you with a healthy surface ready for oil. You can also read more about the process in our guide to sanding balconies and wooden decks.
Oil is part of regular maintenance
Oiling is regular maintenance. Once the deck has been sanded and oiled, apply fresh oil before the previous treatment wears away completely. This helps preserve its colour and condition and reduces the need for heavy sanding in future.
We can handle the job from start to finish: sanding back to sound wood, choosing an oil suited to the species and applying it for an even, lasting colour. You receive a fixed price before we start, no surprises along the way, and we always respond to your enquiry within 24 hours. Call us at 20 98 88 11 or send us a message for a no-obligation quote to restore your deck.
Frequently asked questions
Which deck oil is best for pressure-treated wood?
For pressure-treated pine and spruce, you should use a deck oil designed for pressure-treated wood, preferably pigmented in a brown or teak shade. The wood is soft and absorbent, and a pigmented oil preserves the colour and provides the UV protection that keeps the wood from turning grey. Softwoods typically benefit from treatment once or twice a year.
Should I choose clear or pigmented deck oil?
Pigmented oil suits most decks because it protects against UV rays and keeps the colour for longer. Clear oil shows the natural wood without adding a tint, but gives less protection from greying and needs more frequent maintenance. Choose according to the appearance and upkeep you prefer.
How does deck oil protect against the wood turning grey?
Wood turns grey because the sun's rays degrade the surface fibres. An oil with a UV filter and pigment creates a protective layer that captures a large part of the rays before they reach the wood. The pigments in a coloured oil protect significantly better than a completely clear oil, which is why a pigmented deck retains its colour considerably longer between treatments.
Can I use the same oil for hardwood and pine?
Choose a product approved for your wood species. Dense hardwoods such as ipé, teak and cumaru need an oil that penetrates well. A thicker oil intended for soft pine may remain on hardwood as a sticky film that collects dirt.
How much does it cost to have a deck sanded and oiled?
The cost depends on the deck's size, wood species and condition. You will receive a fixed price before we start. Send a message or call 20 98 88 11, and we will respond with a no-obligation quote within 24 hours.