Should I stop at Optimum Polish with a white pad?

[Scorponox]

I have a black 99 Grand Prix and I wet sanded the entire car and used Optimum Compound and Polish and basically have brought it to a swirl and scratch free finish...with my last step so far being a OP with a LC white pad @ 1500. It looks really good but I am wondering if I should stop here or keep going. Do I need to use something else or should I just seal it with multiple layers of Zaino Z5 and Z2?



The camera had a really tough time trying to focus...



http://i70.photobucket.com/albums/i98/Scorponox/finalstages017.jpg



Spoiler and trunk lid

http://i70.photobucket.com/albums/i98/Scorponox/finalstages011.jpg



Hood

http://i70.photobucket.com/albums/i98/Scorponox/finalstages023.jpg