Spot primer dry, time for expired aircraft sealant AKA liquid fart!!. CS3204 A 1/2 . This is a liquidy brushable flowable rubberized sealant. I used a cut down acid brush to get it into all the spots where the primer was even up on the sides of the drip rail to seal it in. It flows out well and brush strokes disappear as it dries. It is paintable and doesnt shrink or crack. Contains sulfates for corrosion resistance. You always remove the tape masking while its wet.
This stuff will outlast my sons lifetime as well, and he's only 6.