The answer to this question isn’t black and white. There are times when it is fine to paint directly over old paint, say if you are painting a wall with a colour of paint closely matching the existing colour. In this instance you wouldn’t need to prime the existing paint beforehand. Here all you would need to do to get the wall ready for painting would be to give it a wash to get rid of oil, dirt and grease. And then repaint the wall with perhaps two coats of the new colour.
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