RV14 emp ordered. Now what?
I decided I was going to primer my RV-9A because I wasn't sure if I was ever going to be able to afford a hangar and the finished airplane might have to live outside near the coast. I decided if I was going to go to that trouble, I might as well go with the best primer I could find which turned out to be Super Koropon epoxy primer. This needs Alumiprep and Alodine preparation. This primer is "fluid resistant" (Skydrol, avgas, oil etc.) and I'm glad I used it and would probably use it again. I was able to paint outside almost all of the time (especially for wing skins) if I picked my days. I also built a small spray booth inside which used a furnace blower to exhaust outside my shop.
Most of the effort in primer painting was in the surface preparation and after painting cleanup. In my view, if you are really concerned about internal corrosion, then "rattle can" primer will give an illusion of protection rather than real protection. Don't know about Stewart Systems. It's a lot of work to properly primer the interior surfaces (that is, to make sure the primer really adheres to the surface), so I'd encourage you to do a little more research. What are your reasons for priming, and then select a primer to do that job. Talk to the paint manufacturers as well as posting on this forum.