I really need to look more into this semi-permanent nano coatings, such as GTechniq C1, problem is, you really need a unit to apply to properly, which I can't justify, being part time.
Jeffs probably would see you through, but I'd perhaps look at re-applying the Prime base and starting again on the layering, as dirt and contamination will have built up over time between the layers, which in turn can affect durability.
The great thing about Jeffs is the ability to get a layer of protection down in minutes, so on the odd warm, dry day in December, you can boost the protection, quickly.