How do i create rust effect on photoshop?

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I`ve got a texture map of metal rust if you want to use that as a starting point.

Ok here we go...

-Pick two colors, red and a deep orange/brown.
-Use them as your foreground and background colors.
-Render clouds.
-Change your foreground and background colors a bit so theyre noticeably different from the last two but still "rusty" looking.
-Render inverse clouds as many times as you like. You can also change your foreground/background colors again for some weird effects but keep them rusty.
-Add a little noise. Not too much but enough to make it look grainy.
-Stretch your image either horizontally or vertically but not both. Give it ALOT of stretch. Maybe 3 to 5 times the width or height.
-Add a little more noise as needed.
-Apply lighting effects, use a spotlight with the red channel as the texture channel. Adjust the light so its not too much but not too dark. Also adjust the bump height to a desireable level.

Thats it.

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