I have the common dealer-installed sunroof in my 87 GT. Thanks to input here, I'm aiming to get a roof with a factory sunroof, but that is going to take some time and will involve painting the roof and probably the entire car. In the mean time I need the thing water-tight. The metal frame around the window is corroded, especially at the front where the tabs (used to) insert. I tried caulking it up with tub and tile caulk last fall but that didn't work. I'm looking for a recommendation for a product to seal the darn thing tight until I can get it done right- I need the car usable in two weeks.
I wouldn't see why clear silicone won't work. I had a Dodge Daytona back in the day. This sunroof glass had warped somehow leaving a 1/2" gap in the middle. I sealed it up with silicone and never had a problem with it ever again.