How to Apply Textures to Uneven Surfaces
Applying texture to a flat surface, or flatly applying a texture across a whole image (as a means to age it or degrade it) is simple stuff. Realistically applying a texture to an uneven surface is much more hands-on (more so than simply overlaying a texture and changing the Blending mode).
Final Image Preview

Complete tutorial : psd.tutsplus.com
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