What is the preferred method for removing paint or coatings from aluminum?

The preferred method for removing paint or coatings from aluminum is the use of chemical paint strippers or abrasive methods. This approach is effective because it minimizes the risk of damaging the aluminum surface, which can happen with more aggressive methods. Chemical paint strippers are specifically formulated to dissolve coatings without harming the underlying metal, making them ideal for the delicate nature of aluminum.

Abrasive methods can also be safe if appropriate abrasives are chosen that will not gouge or deform the soft aluminum. This allows for efficient removal of paint while preserving the integrity of the aircraft structure. It is crucial to select materials and techniques that are compatible with aluminum to avoid corrosion or weakening of the metal.

Other methods, such as wire brushing, high-pressure water blasting, or using heat guns, may not be as suitable. Wire brushing can potentially scratch or damage aluminum, while high-pressure water blasting could create a surface that is susceptible to corrosion or lead to water ingress in certain areas. Using a heat gun carries the risk of warping the aluminum or affecting its structural properties if not used carefully. Therefore, chemical strippers and careful abrasive methods are favored for their balance of effectiveness and safety for aluminum surfaces.