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I had a painting do that before and I noticed it a few days before a submission to an exhibition. I didn't know about varnishing at the time so what I did was put an even coating of linseed oil over the entire surface of the painting.
It was risky at the time because things could stick to it during transport, like leaves and dust bunnies. Although, it ended up working because the lighting in there would have exposed the areas that dried quicker then others if I had not covered the surface.
A local artist here told me that he just varnishes his paintings soon after he completes them because he does not always have the time to let it dry and wait 6 months. The varnish would be hard to remove later on but I'm with him on it since I have made an agreement with myself to not modify the painting anymore after my signature goes on it. I now varnish as soon as they are dry to the touch.
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