It may seem to many that there is nothing complicated in the process of painting the metal, you just need to take the brush, to wave it into the paint, evenly lubricating the surface. But in fact, everything is not so simple. The paint, like metal, can be different, have different composition and both of these materials may not be compatible. How to paint correctly? What should be considered?
Types of colors
Today, in many cases, the use of modern primers and enamels (alkyd or epoxy) or special acrylic paints, even those that can be diluted with water. Of course, for painting metal, you will not be offered ordinary paint of the water-dispersion type, but will be recommended to use compounds with special additives that protect against corrosion, the appearance of rusty spots, and which form a dense upper ball. Special colors will cost more, but their service life will be much longer precisely thanks to the upper elastic ball.
In order for the choice of paint to become as correct as possible, you need to find out what metals you will be engaged in.
Black iron – it is from it that the lion’s share of all metal structures is made even today. This kind of material is very fond of external influences, and especially to the appearance of rust, so you need to paint it without fail. Alpine primer with zinc compounds (chromate, phosphate) can best protect iron and steel surfaces from slow, but true destruction.
Galvanized surfaces are less sensitive to corrosion, or even completely not subject to it. Therefore, such iron is often used during roofing. With proper installation and operation, it may not lose its qualities for at least 10 years, but painting will be able to increase the service life and very significantly improve the appearance. However, when painting, do not use oil and alkyd paint, galvanized iron with these types of colors does not get along well. Here it is necessary to use exclusively alkyd enamels.
Non -ferrous metal, as is usually not painted, but coated with epoxy or polyurethane varnishes.
Preparation of the surface near Obarsk
Remember that, regardless of the type of paint and the painted surface, this surface must be cleaned first, and only after this procedure to start applying the paint itself. No wonder they say that successful painting depends on how well the surface was prepared. Rust, old paint, fats and other dirt should not remain on a working basis.
Here you can come to your aid, a scraper, a wire brush or a sandpaper can come. Thus, rust and old paint will retire.
Oils, fats, old dust and dirt, along with soot and soot, will help to wash off soap solution and other non -aggressive agents designed to cleanse the surfaces. After cleaning, do not forget that the surface must be rinsed in clean water and let it dry.
But if you are a supporter of more radical methods – an oxygen -acetylene burner, which is well ignited, will be able to help you in most cases. This method is most often used when it is necessary to clean massive metal products. The paint will simply burn, the rust will exfoliate from the metal surface. Rust transducers will help when rough cleaning did not fully remove the rust and scale.
Phosphatic acid is the main component of such a solution. After applying it, withstand the product for at least three hours, then rinse thoroughly with running water and dry well.
However, there are cases when rust is not removed, or its removal is associated with the loss of the quality of the product that needs to be painted. In this case, buy paint with anti -corrosion additives. Such paint can be applied to rusted metals without preliminary cleaning and processing them. Such paints often have the quality of soils. But at the same time, it must be understood that the primers are designed only to protect metal surfaces from the manifestation of corrosion and provide good adhesion for coatings, and need for the most part in additional painting. At the same time, unequal primers are also used for different metals.
