I applied C1 and EXOv2 to my Tesla. The application of C1 was very straight forward; I am a novice, and this was my first attempt at any coating (when I did it).
It was in the 60s, and I applied EXOv2 about 12 hours after C1. This was based on a consensus of opinions regarding the time window -- mostly from other detailers and Rob. So, I would use the 3-12 hour window. Applying a second layer of EXOv2 was done about 30 minutes after the first coat of EXOv2.
It all looks fantastic! There's one area in the middle of the roof that I had trouble reaching with my arm and buffing, so there's a high spot when you see if from a certain angle. Totally my novice mistake and due to poor lighting in my garage.
I applied G1 to my windows -- love it.
I applied C4 to my trim -- it is holding up very well.
I applied C5 to my new wheels -- I'll let you know in the spring how well it has done

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Admittedly, the hole line of Gtechniq products is pretty silly if indeed C4 and C5 are actually rebottled C1. I do not like the little gauze applications and much prefer the foam block that is used with CQuartz products or the foam block for the DP/PBL products.
I have topped my C1/EXOv2 car with both Reload and C1.5. Personally, I think the Reload looks better.
I will probably apply Opticoat to my wife's car in the spring. I'm conflicted since I have all this PBL coating stuff that I'm not high on anymore.