There isn't any trick to get the car shiny, it's common sense and not being heavy handed.
The "trick" is not in what product, or how it's applied, real depth of shine comes from meticulous preparation of the paint to begin with.
The issue is, and always will be the slap dash way in which most dealers valeters will initially wash the car, more often than not inflicting swirl damage. There is no point at all in applying glazes, products with fillers like AG Super Resin, then topping it off with a durable wax or sealant if the swirls are still there underneath. You WILL see them when the sun hits them at an unforgiving angle.
To get the very best results the only course of action is to machine polish the marks completely out before applying any form of protection. It's not everyone that has the tools, the time and the experience to do this job well, which is why we are advising using a professional detailer if you want a first rate job.