I have not had problems with powder contamination using case lubes. I have used Hornady, RCBS, (BOTH spray and pad) Lyman, (BOTH Spray and pad) and Dillon spray lubes.No issues.
I also use the mica sometimes, mine is a older Midway setup, with a hopper for the mica and a couple brushes standing ready to apply the mica evenly.
Good luck, its a great hobby!!!
CW