3 cut the tip off a tube of clear silicone glue using a craft knife.
How to fix a oval glass plastic door molding.
Once dry it may also be painted.
Use a nailset and a hammer.
How to replace the oval glass in an entry door.
How to replace the oval glass in an entry door.
Tap down any loose or exposed brads holding the wood molding to the door around the glass.
Insert the tip of a putty knife under the molding.
Lay the tip flat on the glass and push the tip of it under the molding rock it back and forth if necessary to get the tip to penetrate under it.
Do all four sides.
Insert the tip of a putty knife between the molding and the frame of the door.
Should you need to stain the repair or the entire fiberglass door consider minwax gel stain.