Here is the best way to get wrinkle finish.....
If you are blasting to bare metal, do that and clean it thoroughly.
1) Get the air cleaner hot. Since it is cold now, I've put mine in a BBQ for a while with the burner on medium.
2) Make sure the can isn't cold, and paint the air cleaner.
3) Take it someplace dry and warm. It should wrinkle up real nice.
I used Harley Davidson wrinkle finish, I couldn't tell the difference between original and that.
People have also had theirs powdercoated wrinkle finish and it looks good.
Ryan