Intended for processing metal surfaces with the purpose of removing corrosion or rust. Converts corrosion products and inhibits the corrosion process on various surfaces and steel and cast iron products with a rust layer thickness of up to 80 μm. Reacts with rust products, modifies them, and transforms them into a base layer for painting. Thanks to the presence of active zinc ions, it provides additional surface protection and extends the service life of steel products. Method of application: shake before use. Clean the metal surface from loose (peeling) rust. Apply the product to the surface with a brush, roller, or by spraying at an ambient temperature of at least +10°C on a dry, degreased surface in two layers with an intermediate drying time of about 30 minutes. The surface can be painted after the surface has completely dried (at least 30 minutes at a temperature of +20°C). Temperature range of application: from +10°C to +30°C. Volume: 500 ml Composition: Deionized water ≥30%, inorganic acid 15-30%, zinc salts ≤5%, functional additives ≤5%.