I'm a bit busy right now, so I just made a quick tutorial. Now many pictures inbetween, no clickables, etc, just the main ones. Anyways, this is how to make those rusty looking things on the outside of metal:
Lets start with the old tutorial metal base:
Make a new layer, then go to Filters>Render>Clouds>Plasma (enable randomizing, and click ok).
Using the wand tool, select the outer parts of the plasma layer.
Ok, you have options now, but the simplest way is to right click, go to select>invert, and then delete the segment (by clicking delete)
Now go to Colors>Desaturate>(the default settings are fine)OK.
Go to colors>brightness-contrast, and bring the brightness up. Click ok:
Now change this layer to overlay (or whatever you want) and play with the opacity to get whatever effect you want.
Ok, now here are the usual tips, comments, etc: 1.)Please ignore any typos, I typed this a bit fast because as I said I was busy. 2.) You can specify the size of the rust spots by changing the toleration of the wand tool. 3.) This method might not be the best, but for the meanwhile it's the only way I know how to do it without making it looks bad (need to work on the manual dodging the rust tactic), but if I do get better at it (or someone else does and wants to), it'll be posted. and finally 4.) I rushed this
entire thing, so if it doesn't look to well, I'll fix it later. Oh yeah, and 5.) I got this method from another gimp tutorial stating how to make rust (it was ment for the brownish rust, not this type), but it works almost exactly the same for this type of rust too. Enjoy, comment, and critic.
