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How to make a reliable window seal?

Since our window installer did a poor job on the interior sealing, after much hassle we decided to do the sealing ourselves. The interior sealant tape was leaking in some places between the window frame and the wall on the frame. Do we need to remove the window to get the sealing tape tight again, or is it enough to scribe the seam between the window frame and the sealing tape with foil adhesive?

There may still be an option to put tape on the front of the window if it is still covered with plaster.

What would you recommend?

• window seal