"So even though I have a pretty intense guide on this subject, I still get hounded with questions like,

"Can You Fix This Texture?" or "How did you fix that texture?"

So, here's the process in a nutshell

This is how I fixed the Pyro's North Polar.

If you want to make a Paintable Texture, the same process is applied. The Paintable areas on the Colour Layer, have to be Greyish/White with the Shadows, AO and Detail you want to keep added. The Layer Mask for the paintable areas should be pure white."