I get asked the same question at almost every site visit: "what oil should I use on my deck?" And almost every time, the homeowner has already been to the big-box hardware store and grabbed whatever the bloke in the apron pointed at.
That's not a good plan. Not because the bloke in the apron is wrong — he's giving the advice he's been trained to give, which is to sell whatever's on shelf. The plan's wrong because the oils on shelf aren't built for what you're trying to protect.
The two products we use on every Endure deck are Equisol Pro E365 and Cutek CD50. Both are penetrating oils, not coatings. Both are built for Australian hardwoods. Both are sold through specialty timber suppliers, not big-box stores.
What good deck oil actually does
The job of a deck oil isn't to make the timber look glossy on Saturday afternoon. It's to keep the timber alive — to penetrate down into the fibres, displace moisture from inside, repel water from outside, and slow the UV damage that turns hardwood grey and chalky over time.
There are two completely different philosophies in deck oil. Coatings sit on top of the timber, form a film, and look great until they start to fail — at which point they flake, peel, and need to be stripped before you can recoat. Penetrating oils soak into the timber, become part of the fibre, and don't form a film at all. They don't peel because there's nothing to peel. They wear back gradually, and you simply re-oil when the timber stops repelling water.
Penetrating oils are what you want on a hardwood deck. The cheapest products on the shelf are usually coatings — or worse, hybrid products that try to do both jobs and don't do either properly.
The way to know if your existing oil is working: pour a small amount of water on the deck. If it beads off the surface, the oil is doing its job. If it soaks in straight away, you're due for a re-oil.
A good penetrating oil works like sheep's wool with lanolin. It doesn't sit on top. It becomes part of the timber, and that's what makes it last.
Why the off-the-shelf stuff usually fails
Most of what's on the shelf at the big hardware stores is formulated for general consumer use across pine, treated softwoods, plantation timber, and the occasional hardwood. It's a compromise product — designed to be cheap enough to sell in volume and look fine for the first few months.
The trade-offs that get made: insufficient resin and oil content (heavily thinned with solvent, so once it dries there's not much in the timber); wrong base oils for hardwood (sit on the surface instead of penetrating); inadequate UV protection (Perth UV eats them faster than they were designed for); and worst of all, they form a film. Once an oil forms a film on the timber, water that gets into the timber can't escape — it sits underneath the coating and rots the wood from inside.
The result: a homeowner spends a Saturday morning oiling their deck with a $35 tin from the hardware store, it looks beautiful for six months, and at the 12-month mark it's starting to flake. By year three the deck looks like it needs a full sand-and-recoat. A different oil from a different shelf would have been a one-coat-a-year ritual instead.
Equisol Pro E365 — what we use most often
The product we recommend for almost every deck we hand over is Equisol Pro E365.
Australian-made penetrating oil, modified linseed oil base, formulated specifically for Australian hardwoods under Australian conditions. The technical bits that matter: it diffuses into the timber rather than sitting on top, contains mould and algae inhibitors, has UV absorbers calibrated for Australian sunlight, and won't ever flake or peel — because there's no film to flake.
The finish is the part we have to prep clients for. Equisol doesn't give you the wet-look gloss off-the-shelf coatings produce. It's a matt finish that keeps the timber looking like timber. The natural grain shows through. The colour deepens slightly without going dark or shiny. If you want the deep wet look, Equisol isn't for you. If you want timber that still looks like timber in year five, it is.
Coverage is around 10–16m² per litre on hardwood. A 5L tin will do most decks. Recoat interval — when applied properly — is generally 12–18 months on a deck in full sun. Compare that to off-the-shelf products needing recoats every 4–6 months and the price difference disappears quickly.
There are colour tones available — six options — that can deepen the colour or hold off the natural silvering process. We use the clear most often, but if you've got merbau and want to hold the rich red rather than let it grey, a tinted version is the right call.
Cutek CD50 — second pick
Our second-choice product is Cutek CD50. Same philosophy — penetrating, non-film-forming, designed for hardwoods. Slightly different chemistry, slightly different application feel.
In our experience, Equisol applies a touch easier and dries faster, which matters when you're fitting a coat between rain showers. Cutek is denser and takes longer to cure. Both produce similar protection. If your supplier stocks Cutek and not Equisol, or if you're already using Cutek and it's working, no need to switch. Starting from scratch, we'd lead with Equisol.
Where to actually buy these
Neither is sold at the big-box hardware stores. That's not a coincidence. Both are made for trade and serious DIYers, sold through specialty timber suppliers and decking-specific retailers. In Perth, you'll find both at Decking Perth and at most quality timber yards.
Equisol Pro E365 is around $165 for a 5L tin — enough to do 50–80m² of hardwood. Sounds expensive next to a $35 tin off the shelf, until you factor in that the cheap oil needs three coats and a redo every six months. Run the maths over five years and the cheap oil costs you twice as much.
How to apply it properly
A few things most failures come from:
- Surface prep. Clean and dry. Sweep, wash with the matched cleaner, let it dry 24 hours minimum. If there's an old failed coating, strip it first with the matched stripper.
- Weather window. Above 12°C, below 30°C if possible. Not in direct midday sun. Not when rain is forecast within 24 hours.
- Application. Quality natural-bristle brush or lambswool applicator. Long, even strokes along the grain. Don't flood the surface.
- Wipe off the excess. This is the step everyone skips. After 20–40 minutes, go back over the deck with a clean dry rag and wipe off any oil sitting on the surface. The oil should be in the timber, not on it.
- One coat is usually enough on a maintained deck. Two coats on bare wood. Three is overkill.
The whole job on a 30m² deck takes most of a Saturday morning, plus the prep day before. Not bad for 12–18 months of protection.
Or hand it to us
A properly oiled hardwood deck is satisfying weekend work. Some clients love the ritual. Others love the deck more than the ritual — they want it to look right, last long, and not have to think about it. That's what Deckcare maintenance service is for. We come back at 12 months with the right product, the right gear, and the right experience. Done in a few hours by someone who's done hundreds.
The first oil is included on every timber deck Perth we hand over. The 12-month follow-up is the start of optional Deckcare. No lock-in.
The deck you spent $40,000 on deserves better than the cheapest oil on the shelf.