I have 3 coats of Dupli-Color gray primer put down on the BT and I'm ready to spray the first coat of white primer over it. The plastic white fins were masked off during the gray application, but I plan to spray them with the white primer coat. Do I need to mask the BT to spray adhesion promoter on the plastic fins before primer? Or, can I just spray the adhesion promoter on the fins and try to avoid getting any of it on the body tube? (You just know it's unavoidable, but I'm not sure if it matters.