Scratch removal on the aluminum that you have is a matter of what you want to end out with. I have the same product on my trailer. I tried to polish some spots on mine and soon discovered that I am not dedicated enough to "polish" my whole trailer. That said I will tell you why. I had a hard time getting the finish to look uniform. For me at least it was very hard to do. I soon became discouraged and looked for other ideas. That was when I found this site.
http://kirkhammotorsports.com/manual2/bodyfinishing/bodyfinishing.shtmlIt is a lot of work but it looks good for years with very little work once you are done. It is also easy to fix minor scuffs and the like by just doing more of what you did in the first place. Getting the grain to be straight has a learning curve to it but can be done. It is way easier than doing a car like in the instructions on the web site. Just use the products mentioned on the site as a guide line, dollar store window cleaner works great on the aluminum. Any way FWIW, that how I did mine and I think it looks pretty good.
Brwbier