What is the installation method for the roof gutter rubber strip?

[VonBeckett]

First, remove the old rubber strip, then use a utility knife and a flat-head screwdriver to thoroughly scrape off the old sealant inside the waterproof channel. Next, use sandpaper to remove any rust inside, clean the channel thoroughly, and then apply a new layer of sealant (apply to the bottom layer) — avoid using too much. Remember to apply a bit more sealant at the corners of the front and rear windshields. After that, install the new waterproof rubber strip. Allow it to sit for 2 hours before conducting a water leakage test by pouring some water onto the rubber strip to check for any leaks inside the vehicle.