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Maybe this will help. Although, I'm not sure where to buy the products mentioned: Proper pretreatment for aluminum castings and extrusions takes place in at least a 5 stage pretreatment system. The system would consist of the following stages: * stage 1: Alkaline cleaner (aluminum-safe, or mild etch) * Stage 2: Fresh Water rinse * Stage 3: Iron Phosphate solution containing fluoride * Stage 4: Fresh Water Rinse (Recirc DI Optional) * Stage 5: Fresh Water Rinse (Virgin DI optional) Choice of cleaner depends on alloy and soils to be removed. The fluoride is the key. It etches the aluminum surface to provide for good paint adhesion. Reduce the stages and you reduce the chances for success. Answer:Aluminium can also be simply bead-blasted or sanded using an orbital sander and 120grit until bright, then with as little delay as possible, primed with epoxy acid etch primer, followed by a high build epoxy primer. An alternative is to use an epoxy primer containing zinc chromate directly on the aluminium.

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