No Primer on Walls

Anonymous asked 5 years ago

When my house was built 10 years ago, there apparently was no primer put on the bare drywall before it was painted. I found this out when I had to repair a wall and the paint literally peeled off in sections. I peeled off the paint on this one wall, primed it and used the same paint as the original guys used. What a difference! My question is this. Do I need to strip off all this original paint before repainting a room or can I somehow primer over it so it adheres to the wall better?

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