When I built my RV-7 I was searching for a good primer and did some tests. The best were the Epoxy Primers. I had one to mix by myself and spray, good product but hard to clean the spray gun, lots of work. Then I found a 2K Epoxy Primer in a rattle can very similar as described here. There is also an activation button and once activated it should be used within four days. Very easy, very clean and very tough staff - but expensive. I use it again on my -8 build.
And yes you should prepare enough parts to use the complete can. And yes there is the occasional part which is not primed. I usually did not use the can completely, so I was able to spray these leftover parts and some areas which were not perfect a while later or the next day. It was dry very soon and hard after one day and ready for riveting.
The primer coat will be damaged with the bucking bar, but it is more a cosmetic thing. The rivet guns are hitting hard and even bare metal is damaged. I found taping the bucking bar over except for the area in contact with the rivet helps.
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RV-7 flying, IO-375 w. P-Mags, 200RV Prop
RV-8 flying, IO-375, P-Mags, 74RV Prop
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