The flat surfaces of the fibre fins have a "texture" and I felt should be primed off the body tube.
Here's the fins lightly taped to a piece of cardboard.
Note all the root edges are facing away. This is the angle they will be sprayed to keep the primer off the root edges.
The lug standoff pieces are right against a root edge to keep the primer off both sides to be glued.
Notice after sanding how most all the primer has been removed from the root and fillet area. This will give a better adhesion of the glue at the root edge.
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