Hi,
One of the problems with ceramic coatings is how do you really know it's doing its job. Regardless of how even it was coated it will wear different across the car such as horizontal surfaces appose to vertical, heat or dirt prone areas etc. People say how the water sheets, dirt doesn't stick or how easy it is to clean but none of those really gauge the situation reliably. The next question comes with recoating time and whether you have cleaned off the old ceramic coat or just putting the new coat on the remains of the old coat so it won't actually be bonding with the paint. Also the compatibility of the new coat with the old coating needs some consideration.
Don't get me wrong ceramic coatings are great....for the daily driver you are selling in a few years. But for an occasionally driven classic car with no intention of selling, I would take a different approach.
Number one rule is don't be harsher then you have to with the paint. Don't start every detail with a cut and polish, don't even clay bar the paint if it feels fine. Do a test area with the lightest touch first and work out what your paint needs.
Don't have anything bad to say about jetseal as I used it for years. But like Wolfgang 3.0 best now as it just seems to have a more magical gloss. I tend to end up topping it off with Dodo juice purple haze though not because it needs it but because I like the wax look.