Residue glue on face/crystal - Watch Repairs Help & Advice - Watch Repair Talk
left is after some super glue, sanding, and poly watch. right is what the watch looked like before. I've found that on plastic crystals you can use super glue to fill deep
Watch Glue | Stream free on Channel 4
GS Watch Crystal Cement Hobby Glue - YouTube
UV Adhesive MINEFIX for watch crystal glasses - UV Adhesive Glue for watchmaker