Do not put RTV on the threaded shank of the screw. Look at the inside of the breather cover. RTV goes in the groove that goes around the perimeter of the breather and follow the grove inside and you will see where it surrounds the screw holes and also the dividing partitions in the interior of the breather cover. RTV goes inside that grove and thus will surround the screws from the inside and make the seal. Often some RTV squeezes onto the threaded shank as you set the breather in place and tighten it down. Takes just a small thin bead of RTV.