Mundane.....I deburred all of the gear tower components (both edges and holes), I then scuffed the sides that would be primed (I am leaving the cockpit side of the parts unprimed as I plan to use a more durable expoy primer for those parts, but the insides get the 7220 primer treatment). I then cleaned with acetone and then primed. Doesn't sound like much if you say it real fast, but it was a solid 2+ hrs.
PS I also machine countersunk the nutplate attach holes on the aft side of the right gear tower per the plans.
Machine countersinking the nutplate attach rivets into the back of the right gear tower.
Deburred and ready to prime.
All of gear tower parts are shown - the light colored ones are the powder coated weldments from Vans.