Wooden products have always been and remain in fashion. From this material it is possible to make completely different products, it serves for a long time, is natural and provides a beautiful interior in the house. However, wood requires processing. For example, in order for furniture or flooring to look good, you need to cover its surface with some means. To do this, you can apply polyurethane wood varnish.
General characteristics and material properties
This finishing substance today occupies a worthy place among construction products. Polyurethane wood varnish has two components in its composition: a hydroxide-containing resin (diluted with a solvent of organic origin) and a hardener. In addition, there are substances that are made on a water basis.
Polyurethane wood varnish has the following properties:
- Elasticity that prevents the coating from cracking after drying.
- Resistant to moisture and abrasion.
- Preservation of color.
This varnish in recent years is much more often used for repairs and is in great demand.
Material benefits
Now we need to consider the advantages of this substance:
1. The product is well absorbed and adheres to the surface of the wood, which makes it resistant to abrasion.
2. Protection of the product from moisture (even salt water).
3. Lack of unpleasant smell.
4. Durability and strength.
5. The ability not to accumulate a static electric charge and not conduct current.
These advantages make polyurethane wood varnish a really effective tool for decorating completely different products.
disadvantages
Naturally, even in this case, you can not do without cons. Among them are the following:
- The composition of some varnishes contains organic solvents, which when applied to the surface can adversely affect health.
- It is undesirable to use polyurethane varnish for wood for processing children's furniture.
- Substandard substances may acquire a yellow tint over time.
- Really good varnish can be quite expensive.
These unprincipled disadvantages can be eliminated with the help of various additives that can change or improve the properties of the varnish.
Varieties
Polyurethane varnish for wood can be classified as follows:
1. One component. It is an ordinary liquid that can be applied immediately to the surface of the wood. The product is very easy to apply and dries quickly (about 4 days).
2. Two-component. In this case, you will have to buy two packages of the product. They are more often used if it is necessary to process expensive varieties of wood. Such varnish can reliably protect the product from damage.
3. Three-component. To apply such a tool, you need to use a spray gun. In addition, it can be applied in bulk. This varnish is able to give the surface a very beautiful and special look.
In addition, the presented material can be manufactured on a water basis and without it. In this case, the coating can be matte or glossy. Water-based polyurethane varnish for wood is considered safer, so you can use it indoors, as well as for decorating children's furniture. It should also be noted that such a varnish can even out on its own or cannot.
Application Methods
A one-component or two-component polyurethane varnish for wood must be used correctly. There are several ways to apply this coating:
1. Before varnishing, the surface is treated with stain. This helps protect the wood from rapid fire, make it more durable. However, this method requires preliminary grinding of the surface.
2. The use of polyurethane primer, which takes several hours to dry. To make it evenly distributed on the surface, you need to use a spray gun.
3. Application of several layers of varnish. This method is not used very often due to the high cost of the product.
Painting technology
Water-based varnish for wood, polyurethane or another type of liquid must be correctly applied to the surface. A brush, roller or spray can be used for this. It all depends on the type of varnish and recommendations for its use. The coating technology is quite simple:
1. First you need to thoroughly treat the surface: clean from debris, eliminate breakdowns, sand, degrease.
2. Now you can start applying the stain. This will not only give the wood a beautiful shade, but also show its texture. Note that after this procedure, the surface will again have to be sanded.
3. Application of the first coat of varnish. Please note that it must dry well. This takes about 6 hours.
4. Application of the second coat of varnish. It takes up to 12 hours to dry.
5. Processing the floor or other surface with fine sand paper. This will give it maximum smoothness.
As you can see, it is not so difficult to cope with such work yourself. You only need to have patience and time. In the same way, a polyurethane varnish for wood is applied for outdoor use. Here the number of layers can be large to protect the surface from the influence of external negative influences and to ensure the beauty of wood for a long time.
Recommendations
Work using such tools requires compliance with certain conditions:
- In the room where all the manipulations will be carried out, there must be a special temperature regime. That is, the air should not warm up to more than 25 degrees.
- If you are processing the floor, then you need to apply varnish from window to door. At the same time, think about how you will leave the room. To do this, leave unpainted stripes on the surface.
- When working with the roller, apply the product crosswise. This will provide a smoother, smoother layer.
- The two-component composition before work should be diluted exactly with the proportions specified in the instructions.
- It is best to apply with a brush. Thus, you will protect yourself from inhaling particles of varnish. However, use a respirator in any case.
- Before applying the last coat of varnish, thoroughly vacuum the surface and wipe it with a damp cloth.
- Before work, the varnish needs to be slightly diluted with an organic solvent (5% when using a brush, 15% when using a spray gun).
- For applying a two-component composition, it is better to use a mohair roller.
- Please note that such a tool cannot be stored for a long time and quickly freezes.
Now you know how to use polyurethane varnish. Good luck