I moved into my property 2 years ago and filled in all the cracks on the upstairs Windows. They are lateral from the window edge, however they've reappeared twice even though I chipped back to plaster before refilling. A neighbour said he had similar problems and thinks the lintels above 4 bedroom Windows are too small.
Would a skim over the window wall help? Or would they return or maybe I should just put a heavy wallpaper on that wall.
Any advice appreciated.