Here’s the site:
He also has dyes and clear coat, etc. Tons of videos. He was a big contributor to plasmaspider a few years ago but I think he’s gotten busy running the business so he’s not on a lot now.
He has a good guide in PDF form too. You can watch his videos on his site or up on YouTube.
Not too expensive and he’s a quick shipper. You can also get patinas from here
I haven’t used them but have seen good reports. You could also make your own but then you’re buying chemicals and mixing yourself and I find it easier to get them properly mixed than try to figure out the formularies.
(I know you said PM but I figured others might be interested.)