Karen, my VT has two, inch-wide strips of Velcro, one sewn at each edge of the headliner that run its entire length. The back of the hook side is attached to the edges of the gel coat insert with what looks like contact adhesive. That's what I used to fix a couple loose spots anyways.
It's kind of convenient to be able to peel it down to access the wiring up there, to the dome lights
and rear tri-bar light