I have been trying Arches oil paper. It's great IMO, no gesso needed and its archival. There is a bit of resistance to the paint at first, due to some absorbency I guess, but after that the paint just glides on. So far happy with my new discovery. The painting below is oil on Arches oil paper, 11x7 ins using a muted palette, a brush and then palette knife impasto in areas.