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Etch and Alodine
Surface preparation for painting is the most important requirement for insuring proper adherence and performance of a paint system.
Prior to applying the primer coat, the bare metal is given a final hand-sanding and a special wax and grease remover is used to remove any impurities.
The bare aluminum is acid-etched and chemically treated to assure long-term protection from corrosion. Chromate conversion coating material is brushed on and allowed to react with the aluminum surfaces until it turns a brassy iridescent yellowish tint; reaction time is between 3 and 5 minutes. Then the material is blotted off with rags and clean water.
No visible coating residue (yellowish color) will remain on the rag after the last blotting action.
