Wrinkle Finish Prep

I wasn't sure which category to post this question so I put it here.

I have an older set of Cal Custom finned aluminum valve covers that I am going to paint with black wrinkle finish. I've had them bead blasted and was wondering what other prep I need to do before applying the wrinkle finish. I also would like to know if I need to prime them before the wrinkle finish, and if so, what type of primer to use.

Thanks!