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we spray painters get a kick out of when someone replies to paint advice with that line. i lol'd most panel beaters couldnt answer a paint question with a gun to their head...
what kind of elements will this aluminium be subjected to? indoor outdoor? also i know showbags has suggested to double your thinners on the last coat, just be careful, it goes on easier than it comes off. it wouldnt even hurt to test it on a scrap piece as a dry run so that you dont end up having to rubbing runs back (unless your painting flat) and recoating your larger one. adjust your gun and do test patterns before letting it rip...