[liveorpangrazio]

Hiya
The older thread (matte alchemy) didn't get much response and has basically gone away, so asking here in a new slot:

I'm looking for info on mediums, probably custom and maybe in the day a guarded secret for some, that were used by oil on glass/masonite painters.

I've seen a lot of paintings up close at ILM, and am always fascinated by the quality of the surface and finish, so I'm curious if anyone has learned a thing or two about what artists were mixing into their paint to work as quickly, as large, and keep the paint film consistent?