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TRT
Need to paint my truck box body color that is bare aluminum diamond plate. Have SPI epoxy, SPI 2K primer sealer, base and UC left over from truck. Need to know how to prep box before I spray the SPI epoxy.
i know the etch wash that chris posted will work just fine but if you want to save a few bucks then just goto home depot and get the purple industrial degreaser. comes in spray bottle up to 5 gal. its a sodium hydroxide cleaner. it will etch and clean the aluminum in seconds. its a base not an acid which is faster and more reactive on aluminum. just spray it on, let it foam up everywhere then rinse well with water.
Be careful with the Zep Industrial Purple stuff, got some on my ankle, hurt like hell!