Plastered corners usually have a metal bead in them for this reason. You could try something more malleable or the toupret filler with the fibres in it. But that would have to be shaped on application, you can't sand them as they go rubbery.
you can't sand them as they go rubbery.
Idk if I had different fibres, but I was able to sand mine back and then stick any misc ones down with more filler.
However, in fairness this is for an outdoor concrete porch lintel. Idk how well it would present up close inside.
@stevo_com started
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Plastered corners usually have a metal bead in them for this reason. You could try something more malleable or the toupret filler with the fibres in it. But that would have to be shaped on application, you can't sand them as they go rubbery.