HDR great timing with that cartoon ! Loved it !
I now need to explain that the actual vaults are named so because of the concrete tank that they are built on ......Terry ask about any acronyms you are curious about so we can find funny ways to explain them , so much fun .
Now , I wander if Mr. Loo Read is an acronym too ??????
OK , about your window leaks .
Whatever you do , don't use silicone , it will eventually leak and NOTHING will stick to it , even more silicone.
I have had great results with some stuff I got at the local lumber yard . It is called Geocell Pro Flex. ($21) It comes in a quart can , looks like clear honey , brush it on , cleans up with paint thinner.
I gave my cab over windows as well as other roof penetrations a few coats around the seams (the edge of the window and the edge that contacts the shell ) and am now a happy, and much drier camper !
They also make a tube version for caulking guns , not sure how well that works though.