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How To Paint Galvanized Steel

Posted by on August 28, 2019 in Stuff with 0 Comments

One of the most reliable and common materials for roofing is galvanized steel sheet. Durability, atmospheric resistance, convenience and ease of use, as well as many other positive qualities ensured the widest use of galvanized steel in both civil and private construction, in roofing industrial, factory, office buildings, building hangars, garages, warehouses, etc.

Galvanization of the metal

Galvanization is the presence of a thin layer of zinc deposited on the surface of the steel sheet. Galvanization prevents corrosion of metal under the influence of moisture and oxygen, significantly prolonging the life of the metal, metal structures, roofs and any other elements made of metal.

However, zinc itself (although to a lesser extent than steel) is susceptible to corrosion which results in the formation of a powdery substance on the surface known as white rust. It is for this reason that galvanized steel needs a protective coating which provides reliable protection of the metal from aggressive environmental influences.

Is it needed to paint galvanized metal?

Galvanized surfaces (roofs, metal structures, galvanized steel products) need to be painted for two reasons. First, a thin layer of zinc unprotected with paint as a result of aggressive environmental effects (precipitation, salts, exhaust gases, etc.) begins to rust. Secondly, painted galvanized metal has a decorative look and is much more beautiful than unpainted.

Painting of galvanized steel

As a result of many years of testing, paint manufacturers have come to the conclusion that one-year aging of a galvanized sheet is the best option before painting. What happens during this time? During this period, the very effect of the atmosphere will partially prepare the galvanized surface for painting (by removing white rust and creating roughness for better adhesion). Before painting, the galvanized surface must be properly prepared: dirt, grease, salt should be washed off thoroughly, and debris cleaned. Alkaline solutions (for example, washing powder) are used to wash dirt and grease. The residues of detergent should be thoroughly rinsed with clean water (preferably under pressure) and dried well. After thorough preparation, the surface is primed or top coat enamel is applied immediately (if priming is not required).

Paints for galvanized metal

Special paint for galvanized roofs “Cycrol” is a matte acrylic paint containing active anti-corrosion additives in organic solvents. Galvanized paint is intended for exterior painting of steel, aluminum and galvanized surfaces. “Cycrol” roofing paint is used to protect any metal roofs, galvanized steel, sheet profiles, roofing sheeting, steel sheet, roofing tin, gutters, drainpipes, and other structures made of galvanized metal. Paint on galvanized steel has a high opacity and light resistance, excellent characteristics for water resistance and weather resistance. The paint is easy to use and has excellent adhesion to the painted surface. Cycrol roofing paint is the best variant of repair painting of galvanized surface. A significant advantage of paint for galvanized steel is that it does not require preliminary priming of the surface and is applied in a single layer.

Waterproof aluminum paint Serebrol is a single-component anticorrosive enamel for ferrous and galvanized metal based on aluminum powder, epoxy and perchlorovinyl resins, a mixture of organic solvents and corrosion-resistant additives. Enamel for metal Serebrol is thixotropic, has high weather resistant, anti-corrosive, wear-resistant and oil-resistant properties. Aluminum powder enhances the protective properties of the coating due to the barrier effect.

Paints for galvanized metal provide long-term protection of the surface from weathering, humidity, sun, rain, salty air. Paints do not fade, dry quickly,  extend the life of galvanized structures significantly, and give them an attractive appearance.

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