How do I get a good seal inside the strakes and ensure coverage of pin holes?
Follow the plans and use generous amounts of epoxy. What you are shooting for is a tank with a nice, clear, pure epoxy lining. Work the epoxy with a squeegee or brush focusing on getting good coverage along all joints, fuselage sides, center section spar, end rib, vents drains, and caps. Some builders wait for the epoxy to become tacky before applying the next coat. Cover with peel ply or plastic, and verify no air bubbles exist.