 You can, for most parts, you can just about paint anything. You just got to make sure, you know, if it needs a special primer, yes. A lot of your paints are self-priming, but there are some specifics that you would probably want to still use a specialty primer, which will even be on the can. And aluminum would be one if it was worn down to the aluminum and an all-purpose acrylic primer and then a self-priming paint, sure, would work very well.