To your question of does it go fast , yes it does, 1 bottle ( from exsperience) would be enough to spray a body, i used the alclad magnesium to paint a Ferrari 360 and still have some left, it is exspensive but it is nice paint,
It is pre thinned, shake well and airbrush only , you cant use it with a paint brush
this is the Alclad web site, lots of info on their products
http://www.alclad2.com/
give it a go