After some fair amount of experimenting, I came up with a solution that has
held for 10 months/9,000 miles.  I used GE Silicone II- Window and Door
silicone sealant.  This product is available at major home centers. GE
Kitchen and Bath sealant DID NOT work for me.  I roughed up both the vinyl
fabric and glass mating surfaces with fine sandpaper before applying
sealant.  I also cleaned both surfaces thoroughly with denatured alcohol.
Be careful, as denatured alcohol will melt/soften paint, plastic, etc.  I
found that there was less stress on the joint to be repaired with the top in
a halfway up position.  I weighted the fabric to the glass during curing.  I
allowed the repair to cure 48 hours before operating the top.  I should add
that my repair was to the joint where the vinyl top attaches to the outside
bottom of the rear glass.  I hope this helps.  GOOD LUCK.