I popped the right light fairing off and sanded the extra flox away , drilled the two middle holes to the rib and then filled a small gap with SuperFil.

Later, the ProSeal shipment arrived so I went back out to the hangar, mixed up a bunch, slathered it on the flange of the light fairing, clecoed and then riveted it to the wing closeout and rib. I used the Popsicle stick "tool" to make a little fillet.

There's nothing that's every going to be neat about ProSeal but it went OK.