Why do airplanes need priming against rust and corrosion? safety for one.
Hi, welcome to Mojogrip. If you’re new to the aviation community, I’m Mike, and I’m currently building a 4 seater airplane called the Sling TSi. I’ve been documenting the build process of this plane, but many have asked why we are not priming the parts of the airplane before binding or putting them together.

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Priming is a great solution to protect the aircraft from bad rust and corrosion, especially in delicate parts of the airframe. In single engine airplanes like this, some have been known to break apart in midair due to corrosion in the wing spar.

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Corrosion happens overtime when moisture start to sip into the creases of the airframe. This is common for metal or aluminum airframes. And it is especially dangerous when control surfaces or major joints in the airplane gets corroded. This is why all airplanes big or small need to be protected against corrosion.

Now the typical process to prime an airplane that you’re putting together is; you apply priming solution early on all of the parts and pieces before you put them together to form a structure or airframe. The downside to this process is that as you continue to build, and drill holes, rivet or paint, you wear out the priming solution you applied in the early stages. So it sort of defeats the purpose then. Also this process has to be done correctly or the solution becomes ineffective.

A better solution, which I plan to use is to first build the entire airframe, have it painted, then apply an anti-corrosion solution by spraying every inch of the airframe (see as shown in the video). With this you avoid wearing out through drilling or riveting. And your solution becomes much more effective. It is also advised to apply new solution every 2-3 years.

Stay tuned for future video update where we apply this process for my Sling TSi build.

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