I've read many great guides on this newsgroup on plastering and so I thought I'd have a go at replastering some small areas of a bedroom.
Mostly it went well (I got more on the walls than on the floor!) but I did get some rough spots which did not polish out. They are small but look "gritty".
The worse problem is that, although the plaster looks smooth at a casual glance, it is actually slightly "ribbed". The old plaster is also like this but I don't think this looks ok.
Does anyone have any tips for preventing these problems in the future?