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Blending, Gradient, styling
Now right click your, now 3D text, layer and choose 'Blending Options'
In the blending options apply 'Gradient Overlay'
I've used these settings for gradient overlay.
I personally would start off with the cracked rust textures (first 4 images) and afterwards go for the 'heavy' rust so you can actually see what you're doing.
Copy a cracked texture into the Rusty Text project and resize [Cmd+T] it to satisfied size of how you want to apply it on your text.
Cut out the part that you want to use using any method you prefer (Lasso, Quickmask Mode or even use the Eraser)
After cutting it out set blending mode to either Darken or Multiply (wichever suits the best)
NOW : Add awesome RUST Textures
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