Well,

Jon the ''Scalemodelmedic" linked above is definitely an artist (and a very good friend of mine) but I too have a video on my channel and my method is slightly different.

Weathering with pigments

I am also editing a second pigment video together which shows more uses for pigments as they have tons of other uses and abilities when one thinks outside the box.

My advice would be to watch Jons vid, my vid, google a few more and take what you can from all of them.

Hope that helps.

 8)