The blue is going to look different depending on the lighting conditions. In my opinion, I think that's why it appeals to many. It does look lighter and metallic in bright daylight. In dimmer lighting (and in some bright light depending on your view point) it looks midnight blue -- almost black.
Gtechniq C1 and EXO v2 are protective coatings. They become almost like a second layer of clear coat. Their purpose is to protect your paint from UV light, fallout, swirling, etc.
They are in no way protective like Xpel or other paint armours.
It will add some depth to the paint so that it does look glassy. But, in reality the appearance is going to be that of the underlying paint. So, it you have swirls, oxidized paint, scratches, marring, halos, etc. it's still going to look like crap after Gtechniq...just well protected crap. That's why just about everyone recommends a paint correction (polishing) before application. Polishing adds the shine and gloss. Gtechniq just protects it.