Help me feel less foolish if you would....

Shouldn't the bare aluminum be prepped with some zinc chromate or zinc phosphate primer?, I have always had adhesion issues with bare naked aluminum to virtually anything.....
Not bashing the thread, you're doing an awsome job

Unless the epoxy kits have an etching property, I would get an oxidization barrier on the intake...
If I am incorrect, can someone set me straight?
I am used to aluminum boats and have had to use some zinc chromate just to get my bilge pumps to stick in epoxy, that is until I discovered the extra strength hot glue gun sticks (the bomb BTW)...
GT