What I would look for is a thin sheet of plastic. what I am thinking about
is something as thick as a 2 liter coke bottle. Cur this about 4 inches
longer and wider than your sunroof hole, leaving 2 inches on each side.
Step one would be to put several globs of silicone about the size of a
nickel on the metal part of the sunroof and set the plastic in place. Weigh
this down. You want the silicone to squish down to about 1/16 of an inch.
leave this sit overnight.
Now you can run a 1/4 bead of silicone under the edge of the plastic about
1/2 an inch from the edge. Press this down over the roof of the car until
the silicone just starts to ooze out at the edges. Temporarily hold this in
place with some masking tape while the silicone cures.
This should give you a nice waterproof seal and when you do get the parts
you need to fix the sunroof, the plastic will peel off and if the silicone
is sticking to the paint, you should be able to peel it off with your
I would not recommend using sheet metal as if that flies off for some reason
the results could be fatal, also you would probably scratch the snot out of
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