Gary: Your 'distressed G' looked familiar to me so I had a quick search round out of curiosity.

I couldn't find a specific tutorial for it either, but found this image/effect in a few TG threads from Feb 2002 ... Which I think was just after the original glazed/crackled effect tutorial you did in the XXone.

Simple Corroded Copper Effect Tutorial
Rust and peeling crackled paint
Rusty Wallpaper Challenge - Continued

Regards

Su