Epoxy does not stick on plastic/plexiglas!
Hi,
This was mentioned a few times already, also that people lost there targa-stripe. Maybe you can find some info with the search function.
You can scuff plexiglas as rough as you like, but epoxy does not stick to it!
When you make your targa-stripe, lay a few (3-6) layers of tape onto the area where it later will be mounted. Only at the tipper part, not on the rear window (or there just 1-2 to give a bit of play). This to simulate a film of Sikaflex when glueing it on.
Glue your targa-stip with Sikaflex, follow strictly the Sika recommended cleaner/primer buildup. It will never come loose.
If you want to epoxy it on, it is possible, use the Sika recommended cleaner/primer application, then instead of sikaflex, you can use epoxy. It will stick to the primer.