Does PVC soft glue mean film ... or large plastic ... If it is a film, you can spray a layer of treatment agent before foaming, and then pour the glue to maximize the adhesion ... If it is a large plastic, you can polish the surface or coat it with a treatment agent similar to a film. ..

As far as polyurethane itself is concerned, its adhesion to PVC glue is also good. If it is hard PVC glue, no treatment agent is needed.