Clean all the dust off with window cleaner or vinegar.Make sure none gets inside the tank so cover it if possible.Do a thin coat,then let dry and do another coat.Keep adding a coat of paint til light can't penetrate through the glass.It does not peel or flake off as long as its not a glossy paint.It will only drip if you hold the can to close and not move in a flowing motion.Even if it drips,you won't be able to see it from the front anyways.