Mixing mediums bad idea?

rstall

Dear oil gurus, I have a dried first layer of paint made w Marks Linseed and clove oil basedpaint, and need to go to work on another layer but I am out of burnt umber- will it cause issues (like with adhesion and cracking) if I were to use  M Graham brand burnt umber which has walnut oil as the medium for my color mixes (I realize there’s No clove so it’ll dry faster)
thanks in advance
Ryan

dencal

rstall

Assuming the first layer is really dry there should be no problems. Is this a toning layer? A thin layer won’t present problems.

More issues are likely with student grade paints, alkyds, fillers, impasto gels, thickly applied paint etc

As an oil layer dries it shrinks and moves a little as it polymerises. A brittle top layer may be less inclined to move and crack or wrinkle. Linseed and walnut oils are usually perfectly stable as paint additives/modifiers.

Denis

rstall

Thanks Dencal! I believe I used the foundation stain and then a first thin paint layer - yeah it’s been sitting around a year! Yeah just making sure adding walnut based Burnt umber oil to my linseed based ones Yellow-white-blue and red won’t cause a problem.