Wood finishes: oil, wax, stain or varnish? Guide and quiz

🪵 Quiz: Can you pick the right wood finish?

Test yourself in an interactive game – 10 questions, 3 difficulty levels and plenty of interesting facts about caring for wood.

A guide to wood finishes

Each of the four basic wood finishes has its own distinctive character, strengths and limitations. Below we look at each one in detail – from how it works on wood to the specific situations when to use it and when to reach for something else.

Wood oil

Wood oil is probably the most natural of all finishes. Unlike varnish, it does not form a closed layer on the surface but soaks right into the wood fibres and protects them from within. The result is a surface that keeps the warmth and natural feel of the material – which is exactly why our AMADEA serving boards are treated with natural oil.

The most widespread type is linseed oil, used traditionally for centuries. Modern alternatives include tung oil (dries faster, more durable), safflower oil (darkens the least) and hardwax oils, which combine oil and wax in one product. For food-contact items – boards, spoons, bowls – it is essential to choose an oil certified for contact with food, most often odourless mineral oil.

The drawback of oils is that they need regular renewal – once a year for outdoor furniture, and for kitchen surfaces depending on how heavily they are used. A rag soaked in drying oil (especially linseed) can self-ignite; after work, always spread it out flat or store it in a metal container with a lid.

Wood wax

Wax differs fundamentally from oil in that it does not penetrate the wood – instead it forms a fine water-repellent layer on the surface. This repels water and dirt and gives the wood its characteristic velvety sheen. Traditional natural waxes are made from beeswax, carnauba wax (from a Brazilian palm) or carnauba wax combined with turpentine.

Wax is ideal for decorative indoor items whose surfaces are not exposed to high temperatures or mechanical wear. It is also excellent for restoring old furniture whose original natural look you want to keep. For heavily used kitchen surfaces or floors, oil is the better choice, as wax has only limited resistance to heat. Beautifully waxed wooden decorations keep the natural character of the wood while being protected against humidity.

Applying wax is easy: spread a small amount over the surface with a cloth; the heat from rubbing melts the wax layer so it is absorbed evenly. After a moment, buff with a clean cloth or an electric polisher at 800–1000 rpm. Never apply too thick a layer – it leaves smears and dries badly.

Wood stain (glaze)

A protective wood stain or glaze is a transparent tinted coating that gives wood a hint of colour while keeping its natural grain and texture. Unlike varnish, it does not form a thick closed film but lets water vapour through – the wood stays “alive” and breathable. This is a key advantage outdoors in particular, where a closed varnish layer cracks and peels once water gets in.

For softwoods such as spruce, pine, fir or lime, stains are the ideal choice for outdoor fences, pergolas, garden sheds or decking boards. The darker the pigment, the better the protection against UV radiation. For solid timber buildings, a thin-film oil-based stain is recommended – it penetrates deep into the wood and at the same time “glues down” the edges of the grain figure, preventing them from lifting and soaking up water. AMADEA garden products deserve regular care too – see our garden and barbecue section.

Modern stains are made on both water and solvent bases and come in a wide range of shades, from natural wood tones to bold colours. We recommend renewing outdoor stain every 2–3 years, or as soon as the wood starts to turn grey.

Wood varnish

Varnish forms a hard, closed layer on the surface of the wood that resists moisture, mechanical wear and chemicals. Aesthetically, a varnished surface looks striking and is easy to maintain – a damp cloth is all you need. Varnishes come in matt, semi-matt, satin and high-gloss versions and in many colours.

For indoor use, water-based acrylic-polyurethane varnishes are preferred today – they have minimal odour, dry quickly and are kinder to health. Solvent-based synthetic varnishes are better suited to outdoor use or surfaces exposed to grease. Two-component varnishes create an extremely hard surface for very heavily used areas, but they tend to darken over time.

The biggest drawback of varnish is that it is closed: if moisture gets through the varnish layer (a crack or scratch), the wood beneath swells and the varnish splits or peels off. That is why varnish is best for furniture in dry interiors rather than outdoor items. Spot repairs of varnished surfaces are difficult – in most cases the whole surface has to be sanded down again.

Dye stain and impregnation (bonus)

A dye stain is a product intended purely to colour wood to the desired shade. On its own it offers no protection – it simply reacts with the tannins in the wood and gives it colour. It must always be finished with a top layer of oil, wax or varnish. Impregnation, on the other hand, forms the basis of the whole system: it protects wood against fungi, mould and insects and is often the first coat in many coating systems. For outdoor wood, impregnation is practically a must.

The most common mistakes and mix-ups when treating wood

Even experienced DIYers sometimes reach for the wrong product or skip an important preparation step. Here are the three most common mistakes:

Wood finishes compared at a glance

Frequently asked questions about wood finishes