First, you will need to download the plugin from their site:
In the material's bump map slot drag the electric map and choose Copy, swap the black and
white colors with the button (*Tip 2) and lower the bump to around 6 for example. Go back to the blend material and in the Mask (*Tip 3) slot drag the electric map you had created earlier. Choose instance.
Assign the blend material to an object and render to check that the size of the electric map is
appropriate. If it is not, simply change it for both the mask and the bump maps and try again.
On the second image is something that you may or may not get. =) (fig. 2 with map settings)
For different/better results try changing some of the electric map's parameters. As with everything else, experimentation is the key (*Tip 4). It doesn't really look like real rust actually but I kinda liked the effect and wanted to share. =) Plus, if you hadn't already, now you have learned the blending of materials.
Extra Tips:
1 Instance means that when you change a map on any material or a whole material in the editor the instanced map/material will also be changed, i.e. it will be treated as the same map/material, and copy means that the map/material will be treated as a whole new deifferent one which you can change independently. 2 For the bump map the white value is high and black is low.
3 Blend mask- white shows material 1 and black shows through material 2.
4 It is impossible to control the placement of the rust spots, but you can always double-click on the map to show it larger, maximaze the window and capture it to use in PS to place and customize the spots exactly where and how you want them.
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