It is rated for application onto fiberglass and other plastic surfaces.
How to fix a oval glass plastic door molding.
Tap down any loose or exposed brads holding the wood molding to the door around the glass.
How to replace the oval glass in an entry door.
When the molding lifts up 1 4 inch move the screwdriver to the next side.
3 cut the tip off a tube of clear silicone glue using a craft knife.
Once dry it may also be painted.
Do all four sides.
If you choose repair over replace try fixing the damage with j b weld waterweld epoxy putty.
Use a nailset and a hammer.
Should you need to stain the repair or the entire fiberglass door consider minwax gel stain.
How to replace the oval glass in an entry door.