How it is correct to paint metals?
would Seem, what is simpler, took a brush, dipped in paint and smear to yourself. An, no. Paints - that happen different, metals - too. And not all of them are compatible with each other. How it is correct to paint? Let`s try to understand.
Long since a metalwork painted Types of paints with oil paints. However recently apply modern primers and enamels on an alkidny or epoxy basis to protection of a metalwork much more often or special acrylic paints including diluted by water.
Of course, it is not usual vodno - dispersive paints, and the special structures containing anticorrosive additives, and even rust solvents, and forming a dense covering.
Yes, such paint is more expensive than usual oil and alkidny paints, but and is more durable, due to elasticity, high and invariable from service life.
For the optimum choice of paint is also important to know Types of metals what metal should be painted.
Most often a metalwork makes of black iron. This material rusts very quickly therefore it is necessary to paint it. Traditionally for this purpose use oil and alkidny paints.
From the point of view of protection of a surface of black iron and steel, as the best the alkyd primers containing compounds of zinc - chromate or phosphate consider .
The galvanized surface resists to corrosion better. Therefore as roofing material still, despite availability of more perfect materials, use galvanized iron. The zinc covering in itself can serve years 10 - 15, however for increase in term of operation of a roof and improvement of appearance it is expedient to paint also it.
You want that the covering on galvanized iron held on not one season, and for many years? Do not apply oil and alkidny paints, and use the alkyd enamel specialized by .
Non-ferrous metals are usually not painted, and covered with an epoxy or polyurethane varnish.
As a rule, about optimum mission of paint producers specify in the instruction for application.
Cleaning of a surfaceHow were good
paints, all your efforts on an upclassing of a metal surface can come to nothing if you badly prepare the basis for coloring. Not without reason claim that 70, and even 90% of success when coloring metal designs depend on the correct preparation of the basis.
And it consists in cleaning of a surface of a rust, old paint, fats and other dirt.
First of all, clear a surface of garbage. Then by means of a scraper, a wire brush or an emery cloth remove the old exfoliated paint and a rust from a surface.
Wash away fat, oil, the eaten dirt and dust, a deposit and a soot, water-soluble salts by means of soap solution or other nonaggressive cleaners. Rinse a surface clear water and surely let`s dry.
There is also another radikalnyysposob removals of old paint and a rust - metal processing by a flame kislorodno - an acetylene torch. This way is applicable for massive hardware. Paint burns down, and the rust and scale exfoliate from - for differences of coefficients of thermal expansion of metal and products of its corrosion.
If it is difficult to get rid of a rust, after rough cleaning use rust solvents. As a rule, it is solutions on the basis of phosphoric acid. It is necessary to sustain the hardware greased with the converter not less than 3 hours, then to wash out water and to dry up.
For extreme cases when the rust cannot almost be removed, it is necessary to apply paints which can be applied directly on the rusted metal. Anticorrosive additives are already entered into them.
the Following stage in preparation of a qualitative surface of metal - priming.
The primer carries out two main functions - provides to a finishing covering the best adhesion to the basis and protects metal from corrosion, working as rust solvent and a barrier to hostile environment.
It is necessary to apply different primers to different metals. Anticorrosive protection while non-ferrous metals need primers with good adhesion is important for ferrous metals. About purpose of a primer it is possible to learn from the enclosed instruction.
Primers put with a brush, the roller, dispersion, filling or an okunaniye.
can start Now and directly coloring. For a start check whether well paint is combined with the painted surface. Make trial vykrasa on the small square and if after drying of paint there are no visible defects, it is possible to continue.
A brush paint products of a difficult configuration or small flat surfaces. Paint is applied in 2 - 3 layers. Than the surface is more difficult, especially paint coats should be applied, increasing quantity of layers to 5 - 6.
The aerosol barrel is used for coloring of small surfaces and when coloring. Paint is applied with thin layers from distance of 15 - 20 cm. Put not less than 4 layers with endurance between layers of 15 - 20 minutes.
The roller is used when coloring big flat surfaces. Before application, it is expedient to dilute slightly paint with solvent, optimum in the ratio 9:1. At first a brush paint over corners and edges, and then apply with the roller 2 - 3 paint coats on other surface.
Anyway each subsequent layer should be put in 25 - 30 minutes, but no later than in 3 hours, differently paint hardening then the new covering can be put only in 6 weeks begins. The general thickness of a covering has to be not less than 0,1 mm.
Do not feel sorry for efforts on painting, and your hardware will be reliably, are for many years protected and will take a beautiful complete form.