BONDERITE C-AK ALUM ETCH 2 AERO BONDERITE C-AK ALUM ETCH 2 AERO, alkaline cleaner etchant BONDERITE® C-AK ALUM ETCH 2 AERO is a slightly hazy, metal pre-treatment liquid formulated to clean light soiling and for etching aluminum by immersion methods. The solution has a low surface tension which causes uniform wetting of metal surfaces and produces a smooth matte finish on extrusions, structural shapes, aircraft components, truck bodies and similar aluminum parts. Low surface tension which causes uniform wetting of metal surfaces Formulated to clean light soiling and for etching aluminum by immersion methods Normal operating temperature range is +104 °F to +176 °F (+40 °C to +80 °C) with mechanical agitation Produces a smooth matte finish