Wow, everyone pimps Adam's stuff. Not saying it is bad, but there are other products out there that are good. I use Meguiar's Mirror Glaze polishes and sealants along with High Tech Wax 2.0 and a bunch of other products. One great place I have purchased from online is
Auto Detailing Solutions -- Meguiar's Car Wax, Auto Polish & Detailing Supplies Store. Always give me great service and very quick shipping. I'm sure the Adams stuff is good, just throwing out other options.
Most of the Mirror Glaze stuff from Meguiar's is not available in stores so you'd have to buy it online.