What is the first step in preparing an aluminum pinchweld with removed paint or rust?

The first step in preparing an aluminum pinchweld with removed paint or rust is to clean the surface thoroughly. Cleaning with glass cleaner is effective because it removes any dirt, grease, or contaminants that may interfere with the subsequent steps in the preparation process. Glass cleaner helps to ensure that the surface is free from residues that could affect adhesion when any coatings or sealants are applied later.

Once the area is clean, further steps such as addressing rust or applying a rust inhibitor may be necessary, but the initial cleaning lays the foundation for a successful and effective repair. Other methods, like using a wire brush, may be too aggressive for aluminum and could damage the surface, while using an acid wash or applying rust inhibitors would typically come after ensuring the area is clean.