Excellent choice but only if the surface is smooth and clean first. If not it will need to be cleaned with a mild polish and/or clay barred. Then the #7 will make the paint deep and glossy.
I'm a huge fan of Blackfire Wet Diamond. It's a great sealant! It will last about 2 months for me even in harsh Chicago Winters and has a great, deep, glossy shine. Many detailers use it on very high end cars.
Make sure you use a good bug and tar remover, and clay bar your car before you wax and just about anything will look pretty good.