And the major manufacturers of paints must include the product line of products for “metal”. It’s usually covering forming a solid film upon drying of organic substances with the pigments and fillers. The film thickness is determined by the purpose coatings, and protective properties – thickness and nature of the interaction with the surface base. Group means for the protection of metal surfaces are three: a primer, paint and generic drugs, “three in one” (for example, Alpina Direkt Auf Rost from Caparol, Poli-Hammer of “Poly-P”), which are applied directly to rust. Primer – irreplaceable ways to combat atmospheric oxidation, one-or two-layer coating produced before staining, in addition to the protective properties of telling a better topcoat adhesion to the substrate. When selecting the composition is important to know that for various metals using different primers.
This is the case when a label on the can “universal ground” should be taken skeptically. Ferrous metals require high corrosion protection, while for surface color in the applied composition should have a good adhesion. The protective properties of zinc are well known. Galvanized surface is not longer susceptible to corrosion, and therefore for steel and other ferrous metals better considered alkyd primer containing zinc. There are several varieties of it: the zinc phosphate (used for alkyd paints) to zinc chromate (composition used for the same purpose, but it is also suitable for timber surfaces).
For aluminum base using special primers for the zinc-based paint or urethane. Copper, brass and bronze are usually not dyed – these metals are delivered to market with a factory processing, which protects surface and emphasizing its beauty. If the integrity of this “brand” cover over time is violated, it is best to completely remove with a solvent, after which the base should be polished and cover epoxy or polyurethane varnish.