Hi Walt,
I haven't use any ceramic coatings on my 67 but several of my car friends do and they have nothing but good things to say about it, especially when it comes to removing items such as bird poop and bug splatter. Some of my friends use ceramic coating on their motorcycles and they say it is very easy to remove the road and bug spatter that gets on the front of the fuel tank and fork tubes.
Myself, my car stays in the garage most of the time so I just use a nano wax (Wizards) to maintain protection and I'll dust it from time to time using JaxWax detail spray.
Mike