Using the pointed applicator tip, cut the smallest hole in it you can. On a sunny day after the truck has set out in the sun for a while, fit the nozzle in between the body and rubber and apply a small bead all the way around.
Then,, do the same in between the glass and rubber,, all the way around.
A nylon "windshield stick" comes in real handy for this job. DONT use anything metal against the glass.
Good Luck,
