I drilled, deburred, and countersunk all the bracket and spacer holes. That wrapped up the preparation of the front spars.
The rear spars are Z-shaped, and since it would be difficult if not impossible to dimple the upper flange after the doubler has been riveted on, I drilled and dimpled the coinciding portion of the upper flange now. The scratches you see are just that...the yoke on the squeezer lightly scratched the spar web in several places. No biggie, this gets scoured down, prepped and primed anyway.
Four holes on each of the outer reinforcement plates needed to be countersunk, since flush rivets go in those holes -- so the aileron mounting brackets can sit over them. Here's a rivet in one of the holes to test the countersink depth.
Problem is, one of the four holes is too close to the flange to use the microstop, so I had to free-hand it. Makes you appreciate the microstop.
Using a punch, I lightly punched some markings on the parts so that I'll be able to identify them after being prepped and primed. I spent quite a bit of time alumiprepping and alodining everything. Here they are hanging out to dry on a makeshift drying rack (clamped 2x4 and nails). The little thing on the ground is a small space heater that I'm using to help the drying process along.
Here's another view. The gold color is the indication of the alodining process.
I picked up some "poultry netting" (more commonly known as chicken wire) with which I made...
...a paint tray of sorts.
And here's how it worked...
Since it's pretty chilly out here (high 50s at night) I'm going to let the primer dry all night. I still have to prep and prime the rear spars themselves, and I need to spot-prime the countersunk holes in the front spars. That'll come tomorrow or another day.