The chrome-free Autoprep Etching Pen CF allows the technician a convenient way to easily apply a self-etching, metal-prep coating that primes aluminum, bare steel and galvanized surfaces. Offering superior corrosion resistance and excellent adhesion for the paint system subsequently applied. This process is achieved by simply applying the solution by means of the Autoprep Etching Pen, an application technique smiliar to that of a felt marker. This system is used to duplicate automotive manufacture corrosion resistance.