This document describes a hand-applied@ nontank@ phosphoric acid anodizing process for surface preparation of aluminum alloys required to achieve optimum bondline durability for structural adhesive bonding. This surface preparation system is designed to be used where a metal bond repair is required on a component or assembly that cannot be immersed in a tank. This surface preparation system has been validated for use with 180??(82?? and 250??(121?? service@ elastomer-modified@ epoxy adhesive@ and corrosion-inhibiting primer. The process described herein is the result of extensive evaluation of structural and durability performance and detailed analysis of the individual bonding surfaces. While the process described herein was originally developed for use in the adhesive-bonding of parts@ components@ or assemblies for aircraft@ it is applicable to nonaircraft bonding operations as well. The procedure is normally used in repair operations. Safety - Hazardous Materials: While the materials@ methods@ applications@ and processes described or referenced in this specification may involve the use of hazarous materials@ this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved.