The prism effect after Exo should clear up a fair bit as the coating cures and the solvents evaporate fully by the way.
No photos from me, largely because I'm on my phone at the moment, but my method for moderately deteriorated lights was to use Scholl S20 Blue on a Crimson Lake Country pad by DA to tidy up. Always followed by an IPA wipe down prior to dealing.
Sealants that I've used include;
- FK1000P, lasts a month or two on headlights but needs to be reapplied regularly to keep further damage at bay.
- Hubikote Hubitrim, lasted about 6 months but within a year the headlights were starting to deteriorate again.
- whatever wax or sealant was going on the rest of the car, lasted a month tops and needs constant reapplication to top up the protection.
Currently using GTechniq C5, applied about 3 weeks ago so I'll update accordingly for as long as I own the car.