when do you need to replace the rubber channel? On my window, practically the entire outside window was just smeared with silicone caulk everywhere. That is why it is such a pain to clean. Inside the aluminum frame (on the external half) there was butyl tape that i am already replacing. I assume that the inside rubber channel can stay in-place and just reseal it from outside with DOW 795? So in summary, i will have new butyl (1/2" width x 1/8" thickness) tape on the external part of the window between fiberglass and outside window frame, and then a 1/4" seal with silicone around the actual outside glass to re-seal it. My question is whether i need that additional silicone bead around the aluminum window frame on the outside, is that needed or just an over-kill? Does that make sense?