Sanded reverse side of fuselage bottom skin to remove excess Optiflow primer resulting from rolling the opposite side. Cleaned the sheet with with acetone, wiped with tack cloth and sprayed with Eastwood canned two part epoxy primer wearing respirator. Same to starboard ruddervator hinge joint and windscreen strap.
To date, the epoxy primer appears more permanent with better adhesive character than automotive rattle-can self-etching primer.