Has anyone figured out a good way to fill in the slots on the outside of the dome ring that tend to collect and hold water? This isn't a functional issue but over time algae, bugs, bird poop, etc. tend to collect in these slots/grooves and create a mess. Not much sticks to ABS plastic, but the "filler" doesn't really have to bind tightly to the ABS, just fill the space. Perhaps some type of casting resin, plaster of Paris? Any ideas appreciated!