Countersunk the lower rivet holes for the rear spar reinforcement. Scuffed and cleaned the metal parts for priming with scotchbrite and cleaned with acetone. Primed with NAPA 7220 rattle can self-etching primer. Got it done so I can start riveting things together tomorrow (saturday).
Countersinking the rivet holes in the bottom of the rear spar reinforcement (cordless drill was dead)
Scuffing the surface to be primed using NAPA 7220
Parts are primed - amazingly few parts in the vertical stab