I have a Kodiak Cub 20' trailer. My TT is a 2018 model.
Flanged window frames are sealed using Butyl tape. It is a soft black material that comes in roles.
Unroll it. Remove backing. Place it under window frame flange. Tighten window frame screws. Tape is compressed in place.
When properly installed, butyl tape lasts many years.
TPO rubber roofs require frequent service for sealant cracks and separations. Windows, door, and fittings generally do not need frequent service.
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Paul Bristol
Dutchman Kodiak Cub KD176RD 2018
Nissan Pathfinder 2015
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