Filling hairline crack

Joined
14 Jul 2016
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United Kingdom
Hi all,

I'm trying to fill and paint over a hairline crack in my wall but I'm having an issues whereby however much filler I use, it seems to dry below the level of the surrounding plaster. I assume its shrinkage?

I've tried both No Nonsense and EasiFill and both dry the same. Also tried wetting the plaster beforehand. Should I be PVA'ing the crack first?

Any help would be gratefully received

C
 
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