i have a stair winder that was plastered pretty badly, it was sagging and dipping in all the wrong places and just looked a mess. I started out by using easifill to neaten up the part closest to the vertical timber of the bannisters, and then chiselled off the high points, amd filled the dipped parts with bonding. The shape is more or less how I want it, but the surface is a mixture of bonding, easifill, and painted skim. I’ve scored and PVA’d most of it and it seems solid. I don’t have any experience of using skim. What would be the best was to get a smooth finish? I don’t know if its possible to skim over easifill? Could I easifill the whole thing? Or is this a job for a plasterer