You can’t etch aluminum directly. Unless it is anodized–in which case you will etch the coating off of the aluminum–you will need some sort of chemical to etch the surface. Try Moly-Lube, Cermark, or something like this:
You can’t etch aluminum directly. Unless it is anodized–in which case you will etch the coating off of the aluminum–you will need some sort of chemical to etch the surface. Try Moly-Lube, Cermark, or something like this: