AJ,
Could you let us know what product you are using? It appears to be a mild abrasive with a wax.
From the pictures, is appears, that it is actually polishing the surface. The original finish is what is called a "mill finish" or as-it-comes from the rolling mill. The original has a light "brushed" appearance. This means that there are small lines or grooves in the surface. These small grooves scatter the light and help to hide minor imperfections or scratches in the surface.
When you use an abrasive cleaner or polish, you are removing the grooves (actually removing the high areas between the grooves)making the surface smoother. This makes the surface more reflective and also makes those minor imperfections and scratches stand out more.
At that point, the only way to get rid of the minor imperfections is to continue polishing until you have worn away the surrounding material. When you get to the "bottom" of the scratches, the surface will look uniform, but also be very shiny. Any scratches added later, will stand out on that mirror surface.
Once you go away from the mill finish, there is no turning back.
If you get tired of the constant maintenance that a polished finish requires, the best option is to scratch it uniformly, simulating the original finish. It won't look the same as the original finish, but it will hide the slight imperfections. I'm not sure I want to get into how to "uniformly scratch" your trailer, right now, as that is a different topic entirely.
The Walbernize is a very mild abrasive with a mild chemical reaction. It takes longer, but it doesn't remove as much of the mill finish. If you use it several times, you will notice that it starts to polish the surface too.
