How to choose a varnish for wood for exterior and interior
Varnish for wood - what can and should it be? How to choose it? What first of all to pay attention, buying a varnish for a tree? It is with these questions that the consumer is always asked before purchasing paintwork material (paintwork material). In fact, the issue of choice is not as difficult as it may seem at first glance, despite the fact that there are very many of these products on the construction market. It is very important when buying to take into account the specifics and properties of the object or the surface that you plan to varnish. You can not go to the first store and buy a varnish for a tree that suits the price or color, and do not take into account the technical characteristics of this paintwork.
Painting wooden objects indoors is necessary to protect them from fungal growths, mold, insects, or as a decoration, restoration of household items.Outdoor painting primarily serves to impart tone, dullness or, conversely, shine to the facade and other outdoor surfaces. Any, including acrylic, wood varnish is selected taking into account the texture, properties and characteristics of the wood species. It is necessary to varnish surfaces in several layers. And in cases where the rock is too porous or has many scratches and small cracks, pre-priming and filling is required. The degree of load on an object or surface plays a very important role, therefore, when choosing a material, this should be taken into account first of all.
What you need to focus on, or criteria for choosing varnishes
Wood varnish is used to process and protect wood from various damages and putrefactive processes. It happens for internal work and external. They are very different in composition, specifications, properties and scope. Therefore, before buying a varnish for wooden surfaces or objects, it is necessary to understand, at least in general terms, which one is more suitable in this or that case. Having come to the hardware store for a varnish, do not be lazy to read the abstract and the conditions of use of the composition you prefer, ask if it meets your selection criteria.
Varnish for indoor or outdoor use
Think about where you will use it. If indoors, you need to buy varnish for interior work. If you plan to lacquer the facade from the street or an item that is outside the house, then you need wood varnish for outdoor work. Otherwise, if you choose paintwork materials for interior work and treat them with a street object, then the varnished surface will simply fade or crack.
For example, you need a quality varnish for parquet. Requirements for durability in this case must be taken into account. Pay attention to a line of two-component varnishes on a polyurethane basis - this is the most suitable paintwork material for parquet. It has a high wear resistance, that is, this compound is resistant to abrasion. Also for the parquet you can buy water-based varnish for wood - it is suitable for the treatment of floor surfaces, creates reliable and durable coatings. It is not recommended to buy nitrocellulose - it has the lowest wear resistance coefficient, it will not work for parquet.
Glossy and matte
The degree of gloss in the selection is also very important when it comes to the interior.In each house there are objects with the same degree of gloss, so you need to buy varnish, based on the requirements for other household items or room design. This is not obvious, but the degree of the glossy coating largely depends on how the coatings are applied, on how well the surfaces are ground. The color of the substrate also contributes to the degree of gloss. And, of course, you can not ignore the shade of lacquer.
Most paints and varnishes are dangerous for the human body, since the composition contains solvents: these are nitro-lacquers, polyurethane-based lacquers, and acrylic lacquer on wood for outdoor use, and polyester compounds. Work with such materials should be in special workshops (paint brushes), in non-residential premises, and if there is a need to use them in a residential apartment, then for the period of repair work related to the application of varnish, residents should leave the house for at least a few days.
How long will it take to cover the planned surface with varnish? Few people think about it, but on average, wood varnishes for interior work dry about 6 hours, sometimes it takes a day to dry completely.Therefore, many are trying to have time to do all the work with painting items over the weekend. Water-based wood varnish is considered the fastest drying, while nitroglycerin is the most long-drying.
Complicity: what can it be
Most people in our country know only one-component ready-to-use varnish. After applying this substance to the surface, the solvent contained in the composition evaporates and only a dry residue remains. Professional varnishes (also called wear-resistant) are multi-component products. When working with them, you can mix the necessary components, for example, add a solvent and a hardener. Such a composition tends to polymerize due to chemical reactions occurring in it between the substance of varnish and the hardener.
This refers to the varnish for wood outdoor self-priming or composition "soil + varnish." In other words, not all varnishes can be immediately applied to wooden surfaces. The selection criterion, however, is not obvious, but, as practice shows, most varnishes require pre-priming in order that they do not peel off from surfaces and do not form craters and waves on varnished surfaces.Paints and varnishes that do not require pre-priming, called self-priming. They can be safely applied to the surface without any fear. It is very convenient when choosing and economical when buying (no need to buy extra soil).
Decoration of public spaces, as well as private shops, firms, companies often has special requirements, fire protection is one of them. The same requirements apply to paints and varnishes. Just for such purposes, fireproof varnishes are produced, and to be more precise, they must be specially issued by the manufacturer for a fire safety certificate. To use such a substance is required by the technology specified in the document.
If you follow all the above criteria, choosing the right paintwork material will not be such a difficult task.
Features of paintwork materials
Any paintwork material has its own characteristics and specifications. A brief description of the most purchased - in the list below.
Polyurethane varnish for wood. Does not turn yellow during operation, has a high rate of wear resistance.Does not change the original appearance and texture. It is very picky about temperature and humidity: the temperature should be about 22 degrees, the humidity - no more than 60%.
Alkyd and oil varnishes.Not as demanding on temperature and humidity as the previous one. It is easy and well applied to surfaces, including metal ones, and the ability to penetrate wood pores is good. The only drawback is a low coefficient of wear resistance.
Acrylic varnishes.Used for finishing wooden surfaces. Acrylic wood varnish has a faint odor, similar to the smell of wet wood. Wear-resistant, resistant to cleaning with the use of chemical detergents. Before painting surfaces with this type of varnish, it is necessary to prime the surface first.
Lucky without smell.On this product line I would like to dwell in more detail. Many people are frightened by paintwork due to intolerance to the smell of solvents and other components with sharp unpleasant odors, besides harmful to the body. Manufacturers of the paint industry have tried to create paints and varnishes that are completely odorless, and they succeeded.
They are produced on a water basis, therefore there is absolutely no solvents in their composition.Used for the treatment of wooden surfaces. Produced mainly by foreign manufacturers. However, more recently, our domestic companies have also managed to create their own odorless product. How to use such varnishes? The algorithm for painting works is no different from the use of ordinary ones. They are used both for priming and as a basic paintwork material.