As the resident guy who knows how to use power tools at the museum where I volunteer I got to assist in the installation of new mosaics in former window openings in our historic mill building. My next task is to add some moldings to cover the rough edges. The surface I need to attach them to is hewn granite, thankfully quite smooth. Two questions for the collective wisdom here:
1) is there a colored PVC material or other similarly long lived, essentially maintenance free material I can use to make these moldings? I'd like to use something like Azek, but it only comes in stark white, which would look bad. History suggests that repainting by the mill owners might happen once every 50 years, whether it needs it or not. We took out some badly degraded paintings from these locations that had been untouched since the 1970's. I'd like to use a material that will look as good as possible for as long as possible.
2) How would you attach the molding? I'm considering an adhesive like Sikaflex-111 to avoid having to get fasteners into the granite. A material other than PVC would give me a wider range f adhesive choices.