If the hair dryer feels hot to your hand, it is over 100 deg. However, I am inclined to think the stickup needs a smooth and firm surface to get good adhesion....How come chewing gum sticks to your upholstery so well and the adhesive doesnt? It's probably because the chewing gum gets into the fiber weave rather than laying on the surface. Maybe you can do a Google search for "gluing cloth to metal" or something similar.

Also thought of velcro but the thickness of the velcro would space the trim too far away from the cloth.