Why is proper surface preparation important before painting an aircraft?

Proper surface preparation before painting an aircraft is crucial because it directly influences paint adhesion and minimizes the risk of corrosion. When surfaces are not adequately prepared, issues such as dirt, oil, and oxidation can interfere with how well the paint bonds to the aircraft's surface. If the paint does not adhere properly, it can lead to peeling, bubbling, or flaking over time, compromising the protective layer that paint provides. Additionally, well-prepped surfaces allow for an even application of paint, further enhancing durability and aesthetics.

Corrosion is a significant concern in aviation due to exposure to various environmental factors. Preparing the surface correctly—by cleaning, sanding, and applying appropriate primers—helps create a barrier against moisture and contaminants, which are primary contributors to corrosion. This preparation not only preserves the integrity of the aircraft structure but also extends the lifespan of the paint job and reduces maintenance needs.