3M 08500
you can squeeze it out with a caulking gun, make it small or large depending where you cut the tip.
And I'll give you a tip Adam, if you smooth it out with your finger, get your fingertip wet with a little water, it works beautifully!
http://www.houseofkolor.com/hok/products/specialty.jsp
KOSMIC KROME® (MC SERIES)
Kosmic Krome® represents the application of revolutionary chemistry where platelets of metal can be created at smaller, more uniform sizes than ever before. When applied properly these platelets form a film that...