Never, ever purchase a paint sealant from a new car dealer.  The very same products are available on eBay at a fraction of the cost.  The mark up of dealers can be shocking.   You just need to do a little shopping and check out feedback ratings for car wax or paint sealant.   There are some very good products availableon eBay.  Acrylic is the best main ingredient in protecting a cars paint finish.  Carnuba wax is very old technology and is not compatible with the new clear coats.  There are also some good silicone based protects but silicone is not as hard or durable as acrylic.  Acrylic is compatible with all clear coat finishes as well as older paint finishes.  It does not crack, flake, peel or discolor.  A good acrylic based product can  be applied by hand but ortital polishers are recommended.  Never use a high speed polisher which generates heat and causes swirls marks in the paint finish.  It is always recommended to remove all previous car wax and sealants prior to applying a new sealant.  The best products are 2 steps, with the first step thoroughly cleaning and prepping the paint surface.  Acrylic also works well on painted fiberglass finishes as well.