Wood needs additional protection. First of all, from moisture, as well as from mechanical damage and stains from various liquids. Our advice site in this article will tell you about the most popular option for protecting wood – colorless varnish, about its varieties and application features.
Any wood varnish must meet the following requirements:
- Easy to apply.
- Dry quickly.
- Reliably protect the tree from moisture and other environmental factors.
- Emphasize the beautiful structure of the wood.
- Be safe for people living in the home.
- Create a durable finish that doesn’t need to be updated frequently.
Colorless varnishes for wood are of the following types:
- Acrylic. Diluted with water, no odor, easy to apply, fire retardant. The most popular varnishes today are acrylic-urethane, improved. The portal wrote about them separately.
- Varnish, alcohol varnishes. They dry very quickly and are inexpensive. But the film formed by them is fragile, quickly erased. Also, alcohol varnishes burn.
- Oil. Fatty, dense, dry for a long time. But on the other hand, they form a strong, durable film on wood.
- Resin. Plastic, dry faster than oil, but inferior to them in strength.
- Alkyd. Such formulations often require the addition of a hardener and thickener. Durable, not afraid of moisture. If the composition contains urethane, it doubles the life of the coating.
- Epoxy. They are not erased, are not afraid of scratches, they serve for a long time. Provide very reliable protection for wood, which makes this choice popular.
- Polyester. Multi-component, resistant to chemicals, high temperatures and water.
- Nitrocellulose. They have average strength and durability, but dry quickly. May deform in direct contact with water.
- Polyurethane. Dry for weeks! However, the strength of the resulting layer is comparable to that of minerals. In all weather conditions, such varnishes will reliably protect wood from external influences.
Important! All of the above types of colorless varnishes acquire a slightly yellowish tint after hardening. The natural color of the wood after such a coating always becomes one tone darker. This is not critical, but this change must be taken into account, since the color of the wood affects the appearance of the finish.
The scope of application of colorless varnishes for wood is very wide:
- Floors, including parquet.
- Walls of wooden houses.
- Musical instruments.
- Wooden facades of houses, baths, other outbuildings.
- Terrace and patio flooring.
- Yacht decks.
Important! All colorless varnishes are divided into matte and glossy. The latter give the wood a beautiful shine, but when applied on the floor can make it slippery. In addition, glossy floors are harder to maintain, all dust and streaks will be visible.
Coating with colorless varnish represents the finishing of wood and wood products. Even a non-professional can cope with this process, everything is simple:
- The old coating, if any, is removed from the wood with a spatula or solvent.
- The surface is sanded with a special machine or manually with sandpaper.
- Primer is applied.
- The dried primer must also be sanded with fine-grained emery paper..
- If necessary, the selected varnish is diluted with water or special compounds, according to the instructions.
- The first layer of varnish is applied with movements strictly along the grain of the wood..
- When it dries, you need to apply a second coat to make the coating strong and durable. In the case of glossy varnishes, a third layer will be required – only in this case a noticeable shine will be ensured.
Important! When working with varnish on wood, ventilation must be provided in the room. Modern varnishes usually do not have a pronounced smell, but you still need to take precautions. In addition, in a well-ventilated area, the coating will dry faster..
Matt varnish is more practical, glossy gives a more decorative effect – you choose. Water-based varnishes are safe and can be used anywhere. Polyurethane, nitrocellulose and alkyd varnishes have an odor, which limits the scope of application. It is convenient and quick to apply varnishes in spray cans, but this option is more suitable for correcting the resulting defects. The first time, it is better to use a roller and brushes to apply varnish to the wood exactly along the grain as deep as possible. In addition, spray varnishes are more expensive..