oil painting restoration

Today I worked restoring a painting that I finished a few years ago. It was the first painting using oil on PVC panel that I tried. Apparently the primer was not the correct one to use with PVC as the linseed oil had started to leach from the oil colors. I changed primers long ago so that problem has long ago been corrected. Anyway, I was able to repaint a the few places that were damaged on the painting and it now looks like new. After it dries for a few weeks, I will recoat the painting the retouch varnish.

I anyone else has used oil on PVC panel please let me know if you have had the same problem.