I just used "Meguires Scratch x 2.0" It worked great!
I ordered some 3M paint protective film and will be putting that on in the areas that were rubbed by the seat. Maybe I can use some tape to protect it till it comes?

 

I haven't tried this stuff but I am very interested in it. Read this thread:

https://www.hdforums.com/forum/touri...read-this.html

Then look at

www.stickercity.com

This combo may remove the scratches and allow you to protect the tank further.