I have almost finished my first 20 Legionnaires. The Sergeant with a Power Scythe still has some work to do though as I have to convert him to hold a Deathshroud Terminator Weapon.
I have decided to create scuff marks for my Legion using Storm Vermin fur very lightly sponged at the raised edges. This represents a surface (in this case Ceramite white) being scuffed and scored, therefore allowing dirt / grime / dust etc to settle in those parts. It is not paint chipping off.
My Sergeant poorly blutac'd for shot.
Also I have trialled the AK Interactive streaking paints. Below are the results of my first few attempts. Very easy to use. Just draw a vertical line or several next to each other. Give it 5 mins then with a relatively white spirit free brush just go vertically over and it takes the sharpness off the edges.