liquid electrical tape from a hardware store has worked for me in the
same spot
Loren

Barry, I get the impression that all the 99's have this problem. Although I
don't feel the top should last forever, many are still in quite good shape
overall and have this seam opening up. Anyway, mine was split open about 4
inches on each side when I bought the car almost 2 years ago now. I cleaned
up the surfaces real good with alcohol and glued them together with Permatex
brand silicone adhesive (used on / in engines). Just enough to make good
consistent contact. I put some pressure on it while drying (you've got to
get creative here) and after it was dry, I masked off just a little bit of
the vinyl on each side and applied a nice neat bead. Smoothed it with my
finger and pulled the tape off. It's looked real good (nobody's ever noticed
it actually) .It's definitely gotten me by as the top looks and works great
otherwise.

Good luck,
Chris
99BBB