Their tutorial videos are what got me interested, so I tried a few, and now, The Stamproom carries the the whole line. Opaque, Semi-Opaque and Translucent matte paints.
You have to check out their YouTube videos, here's a link to an informational video they have:
https://www.youtube.com/watch?v=D5DmP4AncA4&list=UUs9MVeZCc8hFqi2_T7ygsfA
Then look at some of their paint projects, this "bump" technique looks so cool.
https://www.youtube.com/watch?v=7nujTk7tGzM&list=TL7qDvyeTizzUnX3xc2grWmTAK9_NfzA3A