Great advice!If you end up going the silicone route use stuff that says ge1. Most other stuff has chemical fungal inhibitors that might not play nice with the loop.
Very familiar with ge1...my other hobby is aquariums. Though when I build tanks, Momentive RTV108 all the way. Though, if I used the RTV108 here, it'd be well sealed, but would never come off.
I decided to order a sheet of the thin silicone sheet and give it a try. Worst that happens is that I break out the ge1, and have a bit harder of a time removing it is I ever would need to.