it says right on the website you can use it as a QD over Fuzion..
I just ordered some of both last night, i'll report back when the weather changes a bit here :)
1) while a sealant will provide protection and beauty, make that paint pop with a coat of P21S 100% (won't last AS long) of even Collinite for some good long term protection
2) a quality hose is worth its weight in gold... and this is gold standard IMO.. my grandfather used these FOR YEARS...
why are you not a fan of carnuba?
Do you already own a hose and nozzle?
Foam gun?
It might be worth looking into some of the Meguiars Detailer line of products, they sell them in gallons and make all sorts of different ones for different uses. They have soap, all purpose, tire shine...