For outdoor woodwork, a special frost-resistant varnish should be used. This composition can be used for decoration and protection of wooden products that are on the street.
In winter, a wooden structure can be significantly affected by a negative temperature, which affects the performance of the surface. For example, if moisture penetrates the structure of a tree in winter, when freezing, the liquid can expand and lead to destruction of the coating. Therefore, any frost-resistant varnish used for outdoor work must have pronounced water-repellent properties.
Today, frost-resistant paints and varnishes are actively used for painting such wooden surfaces:
- roof elements;
- steps made of wood;
- porch;
- outdoor wood furniture;
- wooden floor in the country;
- terrace boards;
- the walls of the bath;
- wooden sculptures.
All these surfaces need not only protection from moisture, ultraviolet radiation, mold and fungi, but also from the effects of extremely low temperatures.
to contents ↑Varieties of frost-resistant compounds
Today, there is a wide selection of coatings for outdoor applications. Basically, all of them do not affect the natural wood texture and do not change the shade of the surface. Modern materials with a frost-resistant effect can have an oil, water and organic base. Any of these compounds forms an elastic film after drying, which increases the surface resistance to mechanical stress at low temperatures.
In addition, the paintwork for outdoor use contains various chemical additives that protect the coating from fungal exposure, ultraviolet radiation, cracking and discoloration.
The key characteristics on which the effectiveness and the frost-resistant coating depend:
- water repellent properties;
- permeability to vaporous substances;
- resistance to mechanical deformation;
- resistance to ultraviolet rays;
- impact resistance.
The main types of frost-resistant varnishes, depending on the composition:
- solvent-based paints and varnishes;
- water-based varnishes;
- alkyd-urethane compounds;
- oil solutions;
- yacht paint and varnish compositions.
Types depending on destination:
- universal compounds;
- varnishes for wooden furniture;
- glossy coatings;
- matte coatings.
Popular paints are solvent based coatings. The composition hardens after complete evaporation of the solvent. As a result of this, a high-strength film is formed.This frost-resistant varnish is ideal for outdoor applications, as it is resistant to abrasion and chemical attack of detergents. However, solvent-based coatings can change the color of a wooden surface by adding yellow tones.
Water-soluble frost-resistant varnish is not so resistant to abrasion. At the same time, such material is considered more environmentally friendly. In addition, water-based material dries faster than all others.
The most durable is considered to be a varnish created on an alkyd-polyurethane basis. It has excellent performance. A feature of oil paints and varnishes based on natural resins is that they can change the color of the floor at the cottage or other wooden surface, making it darker.
Today, it has become popular for outdoor woodwork yacht varnish. This paint material has all the necessary qualities in terms of elasticity and durability that are presented for such compositions. It has increased frost resistance, as well as pronounced water-repellent and dirt-repellent characteristics. In addition, this type of frost-resistant varnish is applied without any problems and does not leave smudges.
to contents ↑Application Method
Frost-resistant varnish should be used only after the surface has been coated with impregnation. Paintwork is recommended to be applied in 2 or 3 layers. All work must be carried out at a positive temperature. Paint and varnish material can be applied using a conventional brush, roller or pneumatic spray. If you are going to work as a spray, then the paintwork is best diluted. Solvent dilute varnish on woodmust match the composition of the varnish.
Before applying each subsequent coat, the wooden surface must be sanded to improve its adhesion. At the same time, the application of the next layer should be carried out no earlier than four hours after painting.
Thus, frost-resistant varnish is very effective for outdoor woodwork. It protects the wooden surface from the negative effects of low temperatures and other adverse environmental influences.
