There is heat activated adhesive applied to the indide of most coverings.
Heat will do two things to most coverings, it will activate the glue and shrink the covering.
Care must be taken when applying heat near seams as the seem, in shrinking, can pull apart.
Clear nail polish can be used when a seam starts to loosen or trim starts to come off. I have even used canopy glue to repair loose trim.
Heat works well for removing wrinkles in ARFs but again be carefull around seams.