TBH marky, I wouldn't use a Glaze on it, its a temp solution to make a car shiny and it will eventually come off after continuous washing....

What I would recommend as I did on my Orion which is in a pretty bad state,

Wash
Clay
Wash
Machine polish with the likes of Menzerna, Gtechniq, Sonus etc
Panel wipe to get rid of any residue
Seal paintwork with something like Fusso wax, Victoria wax, Gtechniq nano sealants

I understand you may need to purchase some of the above bits but the results will speak for themselves...failing that, get a detailer to give it a once over