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Because it will avoid problems with

  • old oil-based paint (you ABSOLUTELY need a primer over an oil-based paint before painting with water-based/acrylic pain)
  • patches made of different material (patches of plaster for example) that would react differently from other parts of the wall
  • bare surfaces (new walls) which won't give good adherence
  • colour changes (if painting over walls of different colours, the result will look different with the first layer(s) of paint. The primer can help)
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14y ago

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