I have been detailing cars since I was 9 years old, have done it professionaly, but learned the most about proper car care in the last 5 years, mainly from spending time on detailers internet forums, then taking that knowledge and using it on my own cars
Carnauba waxes, just like synthethics, are all different. You typical Auto Zone carnuba will have about 5% carnauba and 95% something else. A $2000 jar of "pure" carnuba will have no more than 85% carnauba in it's contents. Read the wording carefully and you will see this to be true.
The problem with carnauba waxes is, they don't last very long. They are not very resistent to heat, so one day in the parking lot on a hot day and that wax starts breaking down. If all you used was carnuba, and the car is a daily driver, your paint will be unprotected in a few weeks.
Synthetics last longer as they are more heat tolerant. Historically, they have not been known for their shine, but that has changed dramatically in the past 10 years. Your Nufinish is really bottom of the barrell synthetic. If you can buy it at a drug store, you not dealing with good product.
I converse with people that are the best in the business. Guys who get flown all over the world by customers, will charge $5000+ and spend weeks prepping the finest vehicles in the world for concourse events. I'll keep things simple here- people that truly know how to take care of their paint will use a synthetic as a base and when they want a little extra pop for a car show, will put a coat or two of carnauba on top of it.
I would recommend P21S carnauba for your wax coat and a product called Blackfire Wet Diamond. I recomend them as they are both excellent products, shine is incredible, EXTREMELY easy to use and the Blackfire will truly protect your paint in all weather for a good 6 months.. You can buy both of these products at
Autopia Car Care Products - Car Detailing Supplies, Car Wax, Car Polishers, Auto Detailing.
While you are there, get yourself some polishing and drying towels (your bath towels destroy paint) and sign up to their forum. Some of the best detailers in the world show their work there and go into great detail on how they do what they do. You will be amazed at what a true detailer does and can do in order to create a REAL showcar shine. Most people have no idea.