Balázs, you never hurted me, my friend. Everything is completely OK.
Ken, to this work the same as to other two I used Crenit-Doll-Collecnion - it's the briwn one, and Apoxie Sculpt (or probably Apoxie Clay - I don't remember exactely, maybe both of them) - the white details on the model.
Creating of helmets is a step-by-step process 'cause first I have to make underhelmet (if this is a right word to a cap sitting on the head) and after that I can made two different helmets. To seperate the layers of materials I use vaseline, right you are.