Most of it was painted on, but I did use a clay for some detail work on the thighs, chest, and helmet. It was needed in some areas to create depth (the crosses on the shoulder pieces, the center if the upper chest, etc...).
Also, fight, I will have my girlfriend take a look at your post when she returns, as she did the paint and detail work and I did the construction work. She'll be able to fill you in more than I can about the technique used.