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How big are said cracks? If hairline - 1 or 2mm I would just carve out a V groove with a stanley knife, brush/hoover out the dust, fill, sand, refill, resand, prime and paint. My living room was covered in hairline/crazing cracks due to the age of the plaster and changing atmospheric conditions (worst around the radiator). I did the above all over and you'd hardly know about it.
For bigger/deeper cracks, you'd want to first fill with bonding then some finishing filler over the top.
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You wouldn't have seen most of these unless you were right up against the wall, but once I started, I got a bit carried away. Most were no deeper than the paint. Plaster itself is solid.
stevo_com
@freddo
I've got some cracks in recently plasterboarded walls and ceilings that need to be filled. What tool do I need to widen them out so they can be filled?
The house was completely renovated about 10 years ago but the building has settled a bit since then. In the last 3-4 years they haven't got any worse, so i think it's about time i sorted them out.