I have a slide glass door mounted on the glassfiber bathtub. Now I would like to take I down and change to a curve shower curtain bar. I believe the track of the sliding door is glued using epoxy on the edge of the bathtub. How to dismount it without damaging the bathtub? Thanks in advance.

If installed by a reasonably competent person the top track will simply rest on the end jams. The end jams will be attached to the walls with caulking and a couple screws. The bottom track will be just caulked to the tub.

Lift and remove doors. Lift and remove top track. Top track may or may not have a couple small screws attaching it to each end jam. Remove screws in end jams, cut caulking with utility knife. Pry end jams from wall. Cut caulking at bottom track. Be careful not to scratch tub surface. Pry up bottom track. Remove remaining caulking with putty knife.