AP 4169 consist of acids which is specially mixed to clean oxides of mixed metals, rust and scales in a short time.

Suitable mixture of various acids with surface active agents , inhibitors make AP 4169 an acid solution without etching heavily of many different metals.

Rust, welding and heat treatment scales are cleaned so easily and provide to the subsequent coating very active surface. At the same time, it creates a film layer which prevents iron surfaces from rust for a long time.