When you ask about the primer are you asking about the grey micro filler primer or the gloss black base?
As far as QC goes Alclad II had some issues a awhile back but they have long since been corrected. Any bottles purchased in the last 3 years won't have any issues. I just sprayed the Alclad Gloss Black base 15 mins before I wrote this and its already dry and solid.
When it comes to painting the only time you will need the gloss black base (which doesn't have to be the Alclad II Gloss Black paint, btw) is when you are using the "high shine" paints. The regular paints just need a smooth surface. It has sort of become internet legend that you need the gloss black base for any of the Alclad II colors. This isn't true.
If you do use the high shine colors apply them in light misty coats and build them up slowly.