As another viewpoint, I prime earlier in the process. My step 1 is to smooth the edges and if necessary 'rough cut/grind/fit/etc'. Step 2 is to prime. Step 3+ is to match drill, deburr, dimple, etc, etc. I do it this way for two main reasons: (a) if I prime after match drilling, I have to run the reamer through there again (extra time) or else half the rivets won't push through from the small amount of primer that is in the hole; (b) it protects the parts better as I'm fitting, match drilling, etc. BTW, Alumaprep 33, Alodine 1201, AKZO two-part expoxy is my choice. Not saying any way is right or wrong, just another way that has worked for me. Best, -Jim
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