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!
-Stacey
OK, I finished my dome swale filling, and it was a real PITA. I tried both spray foam and Hydrocal.
It took about 1.25-1.5 pounds of Hydrocal to fill each swale area, and it was pretty easy to use and mostly leaves a flat surface. The downside is it doesn't stick to the dome and the thinner edges break really easily, In order to give those panels some slope I used quick setting Silicone adhesive to lay a bead at the rear portion of the swale.
The spray foam was pretty messy, even when using the Foambeak (https://www.amazon.com/dp/B01EAZJWG8?ref=nb_sb_ss_w_as-reorder-t1_ypp_rep_k0_1_8&&crid=2K7PBPWQY8130&&sprefix=foambeak) which is supposed to leave a flat-ish finish. I sanded the swales, so things would stick and the foam stuck. I had to shape it while it was on the dome. I used a snap blade cutting knife, hand held wrasp and flat coping saw to cut the foam to shape. In a couple of places the foam had some big voids, so I filled them with Hydrocal which worked really well. The shutter panel needed to be trimmed because it wouldn't close with the filler in the swale. I used a small Dremel cutoff wheel and removed about 1.25" off the bottom.
Once I was satisfied with the filler, I covered it with 4" Flex Seal and Gorilla Waterproof tapes. Flex Seal comes in 5' rolls and Gorilla comes in 10' rolls for the same price at Home Depot. There were a few spots where the tape presented large air spaces, so I had to slit them open, pushed out the air and added more tape. In areas where the tape didn't sit flush with the dome, I slit them to lay them flat. I had some spray Flex Seal paint which was okay, but I ran out, so I replaced it with a quart can of Flex Seal paint which is thicker and flows better. In some places, I poured the Flex Seal paint on to the tape and let it self level to fill uneven spots. I used a more than half the can to finish the job all around the dome.