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Canvas problem
This is an old painting I once started and never finished. It was started many years ago, without a proper underpainting or tinting of canvas.
I have since worked on it, and many layers later, still see little pin-holes where the light shines through it. Another thing I have discovered are stains on the back that look like oil that has seeped to the backside of the canvas.
First, I'd like to know if it is OK to put a layer of paint on the back, and, if so, should it be diluted with a medium or impasto? What color do you recommend to avoid darkening the lights in the front?
Second, could the oil residue on the back be due to overuse of Liquin?
Your help would be appreciated.
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