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I used butyl tape that I bought at Home Depot. It is called glazing tape, it comes on a 3/8" x 50' rolefor less than $10, and is used for installing windows in metal frames. I applied it to the windows on my Ranger 29. I did that about 5 years ago and have had no leaks. I used it on the recommendation of a fellow with a Catalina 25 who said his windows had been installed using butyl tape at the factory 25 years before and had never leaked. He had removed the windows to clean the frames, not to fix leaks. He said the butyl tape was still pliable and sticky, and while it is not an adhesive - the window need to be held in place with fasteners - it seemed to last indefinitely.
I had tried a polyurethane sealant before and it last only a couple of years.
One of the benefits of butyl tape is that it stays pliable and sticky, which is also a drawback. if you use a full-width strip, about 3/8", it is really too much sealant, and will continue to squish out around the frame. it is easy enough to clean off, but just one more thing to do occasionally.
The best way to avoid using too much is to roll it like modeling clay to a rope of about 3/16", then stick the rope in place on the mating surface of the window frame. Tighten the screws a bit all around the frame, going a half a turn of each screw until it is flush with the cabin surface.
Good stuff, and cheap!