probably putty tape
i did some windows in our second MH, (this one is our 5th one)
i used 3M marine polyurethane, it was a bit messy to work with
but those windows never ever leaked again
would probably destroy the window if someone tried to remove them
that stuff is used to secure cleats on boat decks
I recommend using the putty tape
I can explain it to you.
But I Can Not understand it for you !
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1997 F53 Bounder 36s