All parts of an object to be protected must be accessible for inspection, surface preparation, application of the zinc-rich coating and controlling its quality.
The surface of the object to be prepared for the application of a zinc-rich coating must be free of burrs, sharp edges (radius less than 0.3 mm), weld spatter, weld bulges, burns and flux residues. The welding sites of the metal framework (structural angles, plates, etc.) must not have inaccessible holes and cavities. If oil, grease, and other contaminants are on the surface, wash it off with detergents.
New steel (rolled stock) with scale adhering to the primer should be sanded to level SA 2.5 and degreased.
Degrease new steel (rolled broth) without scale.
Old rusty surface – loose rust is removed by hand or mechanically with scrapers, brushes, etc.) or with fresh water at high pressure at 10-20 МРа, followed by degreasing of the surface.
Zinc-plated preliminary surface – contamination and the top layer of zinc salts are removed by hand or mechanically (high pressure water at 10-20 МРа), followed by degreasing of the surface.
Previously painted surface – the paint is removed chemically and by washing (by hand or mechanically or with water under very high pressure 175-275 МPа), followed by degreasing of the surface.