I would after cleaning
off the old paint and back to bare Aluminium, treat for a short period with a acidic type Aluminium cleaner, then with a single
pack self etch primer (this is a very thin coating which actually chemically binds to the Aluminium (You should still see the Aluminium after the coating is applied-again very thin!
Saying that times have moved on in the painting world and International paints are now stating that there inter-protect epoxy primer
is suitable over fresh Aluminium,I would how ever cover with minimum three coats if you plan to over coat with a Copper coat of any variety
I would be cautious of over coating with laminating epoxies as correct epoxy paint
will demonstrate better adhesion and with stand impacts and differing temperatures better than straight Epoxy type lay up over Aluminium(Hence why it;s hard to find any one recommending these Epoxies as primers)