I can trade you Poorboy's Nattys blue (used once) and even include a sample of Collinite 915. Check out this thread of a list of products I'm interested in. http://www.detailingbliss.com/forum/f53/wtt-pinnacle-poorboys-dp-megs-others-6581.html
Natty blue is for darker finishes, it creates more depth, where Natty white is for white and silver...Never had Natty White. I have Chemical Guys XXX, if interested. Its in the same price range, so I think its similar to it.