i posted this in a different discussion board, & i thought I'd share it with the group. My concern now is should i seal the other side also since some people did mention that theirs leaked. >>
i purchased my rebel late 2020 and just noticed 2 months ago of a water leak inside the back passenger side headrest area. i conducted the normal leak search in the 3rd brake light, shark fin and the sliding window and all checked good. i found the leak is coming from the right side window (see picture) by spraying water from the outside.
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i applied very small amount of sealant from the outside between the small gap (see picture) & spread it evenly using a coat hanger.
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i spayed water on it several times after 24 hrs cure time and have gone thru rain & several car washes... so far no leak.