Good afternoon, Attached is a picture of a doorway in my garage. I've no idea what's happened to the corner of the wall, perhaps it had to be knocked off by the previous owners to fit something through the door? In any case I would like to fix it. It means building back up the plaster (not sure what product to use - do it in layers or all in one go?) and re-establishing the corner itself (corner bead or something?). It's just the garage so doesn't have to be perfect! The corner will probably be reinforced with a full length corner brace anyway so it'll hide any imperfections. Would be grateful for suggestions.