Great white sharks. Trophic Pyramid Information that is in video: An ecological pyramid (also trophic pyramid, energy pyramid, or sometimes food pyramid) is a graphical representation designed to show the biomass or biomass productivity at each trophic level in a given ecosystem.
The risk is that you may not be able to remove all the acid and if it is left on the metal it will continue to corrode the metal. So to give you a quick answer, you can use vinegar to etch the aluminum, but you have to rinse the surface thoroughly to remove all the acid residue.
Hello Terps! The first step toward repainting your aluminum window casings is to remove existing flake until the loose pieces are completely gone. Then use Phosphoric Etch as a cleaner / etcher to prepare the metal for priming. Use Rust-Oleum Clean Metal Primer as your base coat. It is an interior / exterior rated, oil-base primer intended for use on aluminum. You can use any topcoat over this primer, but I would suggest using one of Rust-Oleum's oil-based paints with the Stops Rust icon on the label.