I used an applicator pad by hand for the sealant and didnt wax until weeks after. I felt hand applicator was all that is required because they are so effortless to apply. The AG is the very good and lasts well water just sheets off. The wax is harder to spread than the sealant but requires no pressure to remove either. Both allow you to apply to the whole car in hot weather without any probs buffing like normal products where you do panel by panel.
The sealant is like a wax but just man made, however you can only apply wax over sealant not the other way round, so bare that in mind when choosing otherwise you only be able to apply sealant again when polished/clayed.
Sealant offers really wet look reflective finish. Wax is slightly deeper and doesn't appear to reflect light as much, so people apply sealant then wax for the best of both worlds. But as stated once you do this you'll only be able to top up with wax as the sealant won't adhere to wax
Also you can mix the pads and products to your preference and paint type. Obviously start with the least abrasive pad and polish test results and either repeat or increase polish type or pad type to gain desired results