Clear Hockey Mask Blanks

[Darth Veach ●]

I will be getting some clear hockey mask blanks soon and it will be my first time using them. I have made my part3 and 4 masks the old school way by using paint, pencil, etc. What I am wondering is this...do I paint the inside plain white and paint the outside my base color, either ivory or almond, and them sand and scratch away the paint to weather it? Also, do you guys rough up the clear ones before base coating? Thanks in advance for help!