when machining and  welding I use  abrasive flapper disks and a wire 
brush in my 4 1/2" grinder to remove the black mill scale
It's harder than steel and abrasive and hard  on your HSS cutting tools 
so I remove it before machining.  Mill scale also doesn't make a 
reliable base for  paint or take bluing.

On 9/3/2015 11:56 PM, Champ Herren wrote:
> GG,
> I am working on a project that will necessitate me using 2+" angle iron for
> exterior corner braces.  Here are my thoughts.  As always tell me if you
> see something amiss or a shortcut.
>
> I am going to shape the angle to a more aesthetically pleasing shape. The
> screw holes will be counter sunk to be flush.   Then I am going go use
> sandpaper and polish the absolute crap out of it.  Afterwards I want to use
> gun bluing and and create a classic finish.
>
> Any thoughts about this scenario? I value your advice and collective wisdom.
>
> Thanks,
>
> Champ
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