Jean,
I had trouble switching from pastel to oil until I started painting on rigid textured (linen or canvas) lead-primed panels. The other thing I was doing wrong was trying to use the paint too wet. Someone told me to try using "no" medium at all. As soon as I started putting "dryish" paint on this lovely slippery texture, everything fell into place. It went on like pastel goes on Canson paper.
I use a little medium now, but not nearly as much as I tried to use originally. My favorite medium is:
two parts black oil
one part double mastic varnish
one part turpentine( or oil of spike)
I also use Trekell bristle brushes, for nice resistance and softish edges.
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