The tubes of Geneva foundation paint that I've been using seem to be very, very dark. Much darker than the "cardboard colour" that he discusses and makes on his videos. I've made than, and it worked well.
This is definitely easier, but in order to get even close to a neutral colour, I have to wipe it off the canvas with a rag.
Plus, it often feels like it rejects the paint - that is, the paint comes off the canvas rather than laying own on it.
Anyone else with these issues?