Synthetic waxes are going to give you that "wow" factor over longevity. That being said is you go with a synthetic sealant they are made to last much longer than even natural waxes.
If your car is beading when wet than you have some type of wax on it. I would do a dawn bath. Than use a plastic bag over your hang and gently rub the surface. If it feels in any way rough, you need to clay. If it is smooth to the touch you can go right to your polishes and waxes and sealants.
Adam's Premium Car Care - Cleaners, Waxes and Polishes Made in the USA
Car Care, Detail Supplies, Garage Organization, Car Accessories - Griot's Garage 800-345-5789
I have not yet used griots waxes however I have used other products and like them.
90% of my products are adams. Yes they are going to be a bit expensive however your going to get quality. The one thing I hate the most about adams is their shipping prices. Which are out of control!!!
1st purchase
2nd purchase
4-5th
I have been doing detailing for about 5 years now in addition to car audio, and I just recently started getting really serious about swirl marks and thinks with the purchase of my first brand new car.