Oil finishes - the different types and way of application
What Are Oil-Based Finishes?
If you have no previous experience with floor finishing products, finding the right one can be a genuinely difficult task — even the terminology is confusing. Have you ever come across "oil finish," "oil-based finish," and "penetrating oil finish" and wondered whether they're the same thing, or something entirely different?
Oil finishes proper are linseed, tung, teak, Danish, and hard wax oils. They work by soaking into the timber, hardening it from within and offering strong internal protection but relatively weak external, surface-level protection. Lacquers and varnishes work the opposite way — they form a continuous film that sits on top of the wood rather than soaking into it, which gives them the reverse trade-off: strong surface protection but no real reinforcement of the timber underneath.
As the name suggests, oil-based polyurethane lacquer is genuinely built from oils (often 40–60% oil content by volume), but it isn't a penetrating finish in the sense used above — it still cures into a hard surface film, much like its water-based counterpart, just with a different solvent base and a warmer resulting tone. Because it behaves like a film finish rather than a true penetrating oil, we won't be covering it further in this piece; if you want the direct comparison between oil-based and water-based polyurethane specifically, our guide to the two covers that in full.
While penetrating oils are generally less resilient than a lacquer film, they can be genuinely excellent on certain naturally oily exotic species — teak, cocobolo, ebony, and rosewood all carry a high concentration of natural oils in their own grain, and applying an oil finish on top effectively reinforces a property the timber already has, rather than fighting against it. If you're drawn to the specific advantages penetrating oils offer, pairing them with one of these naturally oily species is a genuinely strong combination worth considering from the outset.
Why use an oil finish?
Natural look. Oil soaks into the wood, enhancing the grain and bringing out its natural depth and character rather than sitting on top and dulling it under a film. By comparison, a lacquered floor can look almost like it's been covered in a sheet of shiny plastic. Oil simply achieves a more natural, tactile appearance that a surface finish structurally can't replicate, since the two are doing fundamentally different things to the timber.
Easy to repair. If a surface finish suffers noticeable damage, the standard fix is sanding, or at minimum a proper buff, to restore an even appearance across the whole floor. A good-quality oil finish, by contrast, can be spot-recoated repeatedly over the years without ever needing a full sand — you can typically clean the affected area, let it dry, and apply a fresh coat of oil directly over the worn patch, blending it into the surrounding finish. This is arguably oil's single biggest practical advantage over any film finish, and it's the reason maintenance costs on an oiled floor tend to stay lower over the floor's lifetime.
Low VOC. Volatile Organic Compounds — the chemical compounds in a finish that evaporate into the air as it cures, producing that distinctive "new finish" smell — are commonly found in many flooring adhesives and finishes. Oil-based polyurethane sits at one of the higher ends of what's legally permitted, and some of its VOCs can continue off-gassing for a considerable time after installation, which has been linked in various studies to potential health concerns with prolonged exposure. With few exceptions, most finishes on the market today contain at least some VOCs, but the actual concentration varies enormously between products. Some fully natural oil finishes contain effectively zero VOCs, and most modern penetrating oils sit at a genuinely low level — nowhere close to the concentration found in an oil-based polyurethane lacquer.
More on oil finishes
Linseed and boiled linseed oil. Extracted from flax seed, and used historically for preserving both wood and concrete. Like most traditional finishes, linseed oil ambers and yellows noticeably over time, which actually makes it a better match for darker timbers like mahogany, where that warm shift blends in rather than fighting the wood's tone. It dries extremely slowly — often taking several days to a couple of weeks between coats under normal conditions, which is a genuine practical drawback for anyone wanting a room back in use quickly. "Boiled" linseed oil, despite the name, isn't actually boiled in the traditional sense; it simply has solvents (and sometimes metallic driers) added to cut down that exponentially long drying time and give a somewhat deeper colour straight away. The trade-off is that boiled linseed is generally less durable than the plain, unmodified version. Neither type genuinely competes with modern alternatives on performance — their two real redeeming qualities are a very low price point and being a fully natural product, which still appeals to some purists.
Tung oil. A genuinely natural product, used by Chinese craftsmen for centuries, arguably millennia, before it ever reached Western markets. It's more durable than any other pure oil finish, but its long, multi-day cure time between coats makes it impractical for most commercial applications, where turnaround speed matters. Of the traditional oils, tung oil is, without much argument, the best choice for wood flooring specifically — though it still doesn't match a proper polyurethane finish for raw durability or turnaround speed.
Danish and teak oil. A blend of tung and linseed oil with added urethane, which in practice makes it behave somewhat like a thin varnish rather than a pure penetrating oil. It sits in a genuine middle ground: less durable than polyurethane or straight tung oil, but not as cheap as linseed either. Some consider that middle position the ideal balance for a lot of practical use cases. It also dries noticeably faster than linseed and holds up better against everyday wear, making it a reasonably practical choice where a pure tung or linseed finish would feel impractically slow.
Hard-wax oil. Contrary to popular belief, hard wax oil isn't actually the most durable option in this category. It soaks into the timber reasonably well, but the protective film it leaves on the surface is genuinely weaker than most varnishes or lacquers offer. Its real strength is ease of application — it's straightforward enough that even a relatively unskilled person can apply it competently, which is a big part of its popularity with DIY projects. That said, it doesn't outperform more established, traditional products like teak or tung oil on raw durability, despite sometimes being marketed as a premium, modern alternative to them. Where it does score well is in spot-maintenance: like other penetrating oils, a worn patch of hard wax oil floor can typically be cleaned and re-coated locally without a full sand, and that lower long-term maintenance burden is often what tips the decision in its favour over a harder-wearing but less repairable lacquer film.
Whichever oil you land on, the underlying prep work matters just as much as the product choice — a floor needs to be properly sanded back to bare, clean timber before any oil finish is applied, since oil soaking into old finish residue rather than open wood grain is one of the most common causes of a patchy, uneven result. And because oil finishes are designed for exactly this kind of periodic top-up rather than a full strip-and-refinish cycle, it's worth getting familiar with how that ongoing maintenance actually works before you commit to the finish — our guide to re-oiling wooden floors covers the process step by step.
