If an oil painting is a mess and your attempts to fix it aren't working, take a palette knife to it to scrape off as much of the paint as you can. Then dip a corner of a cloth in turps and rub it over the canvas, removing as much of the paint as possible. What you'll be left with is a canvas covered in a fairly even gray. Leave it to dry and it'll be the perfect ground for another painting.
If the scraped-off paint was still quite wet, mix it together and you'll have a gray suitable for eliminating the harsh white of another canvas too.
Tip from: J.S.
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