Caulk.
If you have used caulk to fill cracks and edges and found when you come to paint over it with emulsion it cracks, this is what to do.
Caulk is meant to be paintable but over the last few years the formulation of paint has changed and emulsion does not always form a film over the caulk.
Paint over the caulk with an oil based undercoat first and allow to dry ,then when you paint over it with the emulsion it should not crack.
If you have used caulk to fill cracks and edges and found when you come to paint over it with emulsion it cracks, this is what to do.
Caulk is meant to be paintable but over the last few years the formulation of paint has changed and emulsion does not always form a film over the caulk.
Paint over the caulk with an oil based undercoat first and allow to dry ,then when you paint over it with the emulsion it should not crack.