So you've experienced that!!
PaintBoss, I'm using Frederix oil painting paper Olio Tela which is the best in the market, I believe. It's sooo good to paint oil sketches. I only use it to some quick sketches which are composition practices or studies for larger paintings. Mostly I use Belgian Linen for oil paintings, even for plein air.
Emily Carr's oil paintings (pleinairs ?) are ruined because of painting on paper?? How come Levitan's oil painting sketches are still in good condition? Also, I know some Finnish artists from 1800 who painted on a sheet of paper and I've seen they are fine! I've seen them in a museum.
But I should talk about water media here and not oils.
Sorry,
JennieJo, for me bringing up other mediums talk here.