Do I need to sand walls before painting

21 days ago
last modified: 21 days ago

I'm painting a room a new colour and wondering if I have to sand the entire wall before the undercoat/primer and coats. I've watched videos which talk about the need to fill holes and then sand the wall.
Does sanding the wall only refer to the areas around where the filler was used, or do you have to sand the whole wall regardless.
Wall has no holes and was previously painted.
Can I just go straight to prime and paint?


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