Protect effectively with the right wood waterproofing

Everyone knows it: If the cozy piece of garden furniture made of acacia wood or the beautiful wooden table is not covered and brought into the dry in time before the thunderstorm pours, the sensitive surface is threatened by weathering quite quickly. However, before you reach for the next best wood preservative or paint and brush, you should do some research on the topic waterproofing of wood. This way, even as an inexperienced do-it-yourselfer, you will be able to recognize what is important when it comes to wood preservation and avoid annoying and, above all, costly mistakes.

Why the wood waterproofing works

The generic term wood waterproofing covers various wood protection methods. The aim of the various types of treatment is to protect the wood preventively against various organisms that could discolor or destroy the wood or – if an infestation is already present – to combat these damaging organisms. Preventive waterproof of wood should always be a priority. The waterproofing agents penetrates deep into the wood. It not only acts on the surface, but is also deeply effective: Protected is the wood from fungi, mold and weathering.

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wood waterproofing

in the do-it-yourself process
Do-it-yourselfers who want to treat wood waterproof apply the wood preservative by painting or spraying. Such work does not require special equipment and exceptional craftsmanship.

However, before you set to work with fresh courage, you should learn about the individual steps and learn valuable tips to achieve a good result. This way you can be sure that the wood will remain attractive for a long time and fully serve its purpose

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What to look for at wood waterproofing?

If you want to treat your garden furniture or other wooden parts outdoors waterproof, you should choose an area as shady as possible to carry out the work. UV radiation can cause changes in some wood preservatives while they are still fresh and not dried. waterproof Never wood in extreme outdoor temperatures! Frost and heat are detrimental at waterproof. A temperature range of 5 – 25 °C is optimal for the application of most agents. When selecting a brush, pay attention to the manufacturer’s labeling. Not every brush is recommended for glazes or paints containing special solvents.

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Your advantages with Nano-Care

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Water repellent effect

If untreated wood is exposed to water, water penetrates. Cracks and crevices are the result. waterproofing has a water-repellent effect and protects against signs of aging.

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The impregnated UV protection

Like any surface, wood used outdoors is at risk of being exposed to an aging process due to UV rays. waterproofing acts like sunscreen here.

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Wood is a robust natural material. Without bark and unprocessed, wood is quickly exposed to signs of aging. To preserve the resistance to wind, sun and rain, you only need to waterproof.

What you need to know about our waterproofing

How long does waterproofing protect the wood? We are often asked this question, but it cannot be answered in a generalized way because the durability of a waterproofing is influenced by several factors. The protective effect varies from wood species to wood species and the ingredients of the wood preservative also play a role. Wood that is exposed to rain and sun without protection needs to be retreated after a shorter period of time than a garden chair, which is almost always under a protective roof.

The different types of wood used in the manufacture of garden furniture and in outdoor structures vary in their susceptibility to attack by blue stain fungi and damage from the elements. Spruce, fir and pine are particularly susceptible and must be carefully protected. Oak and robinia are considered particularly robust and resistant.

You want to learn more about the diversity of our waterproofing agents?

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The technology of wood waterproofing

In practice, various methods are used to apply or insert wood preservatives onto wood. The deeper the wood preservative penetrates into the wood in the process, the more effective the protection achieved with the waterproof. The depth of penetration depends on the method chosen and the type of wood being impregnated. In addition to painting and spraying, which is preferred by most hobby craftsmen, there are other methods for wood waterproofing, some of which we will briefly introduce to you.


Dipping involves placing the wood completely in a tub filled with wood preservative for a few minutes to several hours. With an exposure time of a few minutes, a penetration depth is achieved that is comparable to the effect to be achieved when painting. With longer exposure times, the penetration depth can reach several millimeters. This process is mainly used in the professional sector. For small quantities, the relatively high demand for wood preservative would be uneconomical.

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Hot-cold waterproofing

In this process, the wood is bathed alternately in hot and cold wood preservative. When the wood is in the hot bath, the air inside the wood part expands. When changing to the cold bath, there is a soaking effect that promotes penetration of the wood preservative. Penetration depths of 30 – 50 mm can be achieved with the Hot-cold waterproofing.

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Osmosis process

This process is based on the diffusion principle. In this case, the wood preservative is not liquid, but pasty. It is applied to the wood surface on undried wood. The treated wood is stacked tightly and carefully covered. It is left like this for up to 3 months so that the wood preservative diffuses into the interior of the wood and develops its protective effect.

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Boiler pressure waterproofing (KDI) and boiler vacuum pressure waterproofing (KVD).

The wood preservation technologies described so far are pressureless processes. In the industry, the waterproofing agents is often forced into the wood at high pressure (up to 10 bar). In this way, a more even distribution of the impregnating agent can be achieved in most cases than with pressureless processes. Not every type of wood is suitable for waterproof with pressure. Larch and Douglas fir wood is only suitable to a limited extent for the pressure waterproofing. This process cannot be used for spruce and fir wood.

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The individual work steps of wood waterproofing

Before waterproofing, the wood must be cleaned of any dirt and smoothed. This is best done by sanding with sandpaper (150 – 200 grit). The sanding dust is thoroughly removed with a soft brush and a slightly damp cloth.

The (usually colorless) waterproofing is applied evenly with a brush recommended for the solvent used. Work with long strokes in the direction of the grain. If possible, work on the entire surface in one operation. This is the easiest way to avoid streaking.

It is optimal to let the first waterproofing dry for at least 12 hours. Avoid direct sunlight during drying to avoid discoloration of the wood. Experience has shown that the application of the liquid and subsequent drying causes fine wood fibers to set up, which are removed by intermediate sanding. Fine sandpaper with a grit of 280 to 320 is recommended for intermediate sanding. At the same time, the entire surface is roughened evenly by sanding and becomes more receptive for the next coat of paint. Before that, the sanding dust must be removed again with a soft brush and a slightly damp cloth.

In order for the wood preservative to develop its optimum effect, apply a second coat waterproofing agents. After a drying time of at least 12 hours, you can additionally apply a color of your choice or a colorless varnish. If you apply a primer beforehand, the paint will adhere more reliably and have a higher covering power.

These questions are often asked about wood waterproofing.

A solid and professionally executed waterproofing protects furniture and components made of wood from the penetration of moisture. At the same time, this prevents the penetration of fungi, microorganisms and harmful insects that discolor and destroy the wood. In addition, modern wood preservatives provide effective protection against UV radiation.

This question can not be answered in a general way, because the durability of a waterproofing is influenced by several factors. The protective effect varies from wood species to wood species, and the ingredients of the wood preservative also play a role. Wood that is exposed to rain and sun without protection will need to be refinished after a shorter period of time than a garden chair, which is almost always under a protective roof.

The different types of wood used in the manufacture of garden furniture and in outdoor structures vary in their susceptibility to attack by blue stain fungi and damage from the elements. Spruce, fir and pine are very susceptible and must be carefully protected at all costs. Oak and black locust are considered particularly robust and hardy.

The deeper the wood preservative penetrates the wood, the more effective it is. With methods used in the private sector, penetration depths of only about 1 mm can be achieved. Therefore, waterproofing should be repeated regularly to effectively extend the life of the wood.

Unprotected wood often turns bluish after a short time. The cause of this discoloration is the blue stain fungus, which feeds on the substances contained in the wood cells. Although it does not destroy the wood, it considerably impairs the appearance of the wood surface. If there is already a heavy infestation of blue stain, it can affect the impregnability of the wood.

The wood protection of a waterproofing is limited in time. It is not possible to give a general indication of how long the impregnating effect lasts, as the effect depends, among other things, on the type of wood, the penetration depth of the wood preservative and the intensity of external influences (precipitation, temperatures, UV radiation). As soon as the wood surface feels rough and turns grayish, it is time for a new treatment.

This depends on the type of wood preservative used, the thickness of the application and the environmental conditions. The lower the temperatures during the impregnation work and the higher the humidity, the longer the wood will need to dry after treatment. You should definitely allow for several hours. As a rule, you will find information in the instructions for use of the wood preservative manufacturer, after which time a second coat can be applied and after which time, for example, garden furniture can be taken into use.

Water-based wood preservatives should be painted with a brush made of plastic bristles. Glazes can be applied evenly and without forming streaks using a brush with natural bristles. However, there are not only different types of bristles, but also a variety of brush shapes. Ring brushes are characterized by their high paint holding capacity. Since the ring brush can be easily turned, you can work very precisely and cleanly. The latter is particularly important when painting windows, for example. If larger areas are involved when painting wood waterproofing, flat brushes are recommended, which the trade offers in various widths. Paint rollers are also used for very large areas.

What our customers say

As Nano-Care AG sales partner in the international aviation market, we were able to successfully qualify and list the product with the Liquid-Guard technology by AIRBUS as the first product of this kind for the protection of surfaces against viruses and germs in all cabins.
The Liquid-Guard technology for surface coating is a proven result of scientific innovation “Made in Germany”, which will not only currently, but also in the future, play an important role in the protection of our health.
The service and the professional, scientific support as well as the cooperation for us as partners of Nano Care AG, we can only rate as outstanding and exemplary in every respect.
In particular, we would like to thank Dr. Fabienne Hennessen for her work.

Jörg Schukies , AIRDAL GmbH / Decorative Products GmbH; Quality System Manager / Quality Auditor

Kundenmeinung Jörg SchukiesJörg Schukies

We were looking for an innovative company that could provide modern solutions in different business areas. Nano Care took the time to understand who we are as a company and the market in which we operate. So far, we have worked with their building and textile protection products, Dura ceramic coatings for automobiles, and the revolutionary Liquid Guard antimicrobial coating. The feedback we receive from our customers is more than satisfactory. We wholeheartedly recommend working with Nano Care and implementing their solutions.

Grigor Mihov , CEO Nano Coat Bulgaria

Kundenstimme Nano Coat BulgarienGrigor Mihov

A very professional team!

Nanocare is a reputable company with excellent products, probably the best nanoproducts on the market.
They have been a reliable partner for many years.

Toni Jacquot, NanoProtection, France

Kundenstimme Nanoprotection FrankreichToni Jacquot


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