Elevator trim tab

[Bavafa]

In a hast, I went ahead and primed (Akzo brand) the inside of the trip tab and the wage only to read that the ribs will be bonded and need to be unprimed. Just wondering did anyone else made my mistake and what did you do. One option is to sand the area to be bonded off or just scuff the primed area and bond it that way. I wonder how well things adhere to Akzo primed area or how hard is to remove the primer without really deforming the part. Also is there any other adhesive acceptable other than tank sealant which I take it that it means proseal!