Wood in general



By treating wooden products with wood oils, you replace the natural sap of the wood and prevent cracking.

The best protection you can give to wooden furniture, whether it stands outside all year or indoors, is to use an oil product suited to the individual type of wood and its application.

Only very few types of wood can remain untreated, e.g. in particular teak, but also oak heartwood, larch, Douglas fir, cypress, thuja (Western Red Cedar), and to some extent the Scots pine. They will however become grey over time and will be susceptible to stains, and so these types will also benefit from a treatment that protects the surface against dirt and sunlight.

In the past, pressure creosoting was done using very toxic impregnating products. Today it is possible to impregnate wood using approved environmentally friendly agents. The drawback, however, with pressed creosoted wood is that the natural structure of the wood is destroyed during the process and the wood cracks. This is not the case with vacuum impregnation, in which the wood’s natural sap is extracted at the same time as the impregnating liquid enters the wood, and means that the wood cells are not ruptured. Regardless of which form of impregnation is used on the wood, it is important to keep it dirt and water repellent using wood oil.


Wood that is exposed to fluctuating humidity will quickly be attacked by decay fungus which decomposes the wood.

The wood can be made water-repellent by achieving a smooth surface (via planing and sanding). A water-repellent oil from CAVO can be applied to the satin-finish wood.

Mould fungus and mould spots
Wood that stands in the shade is exposed to disfiguring encrustations of mould fungus and mould spots. These fungi do not decompose the wood, but they may result in permanent discoloration.

Sufficient saturation of the wood with CAVO wood oils will prevent discoloration of the wood and any surface mould fungus or mould spots will easily be brushed or washed off. You should generally avoid storing furniture in humid conditions.

Over a season the ultraviolet rays in sunlight will change the colour of untreated wood. Indoor wood will become more golden in colour, while outdoor wood will become greyer. In the long term sunlight can break down the wood by drying it out and cracking it, with resultant fungus and insect attack.

A surface treatment with oil from CAVO or wood preservatives with colouring pigments. CAVO’s wood oils will preserve the natural colour and grain of the wood.

Drying out
Wind and sun dry out wood so that it forms contraction cracks, and in the worst cases, warps. Contraction cracks are an entry point for moisture, mould fungus, insects and bacteria, especially on tabletops. Warped wood destroys the function and appearance of the furniture.

A surface treatment with CAVO’s wood oils preserves the natural moisture and appearance of the wood.

It is important to maintain and care for wooden furniture properly. This means it will last longer and keep an attractive surface. When treating the furniture, it is always a good idea to treat a small area that cannot be seen. Once you have established that there are no undesirable consequences, you can then treat the whole piece of furniture.

Wood is a living material that changes over the lifetime of the furniture. The colours and structures of the wood change, depending on how much sunlight it is exposed to. Avoid placing vases, lamps and the like on the furniture during the first months because these will leave visible discolorations. The more sunlight the furniture is exposed to, the quicker this process goes. Keep water use to a minimum and use it with care.



Hardwood OilBio Oil