What does everybody use to plaster the walls around sockets, i.e. after chasing out a for a backbox? For the last few years I have used "casting plaster", about £8 for a 15kg (I think!) bag. 1. It sets very quickly, a pain because you can only mix small quantities at a time but ideal for sockets because it dries out so quickly. 2. It's white, and very smooth. Eay to use, priceless if you're hopeless at filling in like I am. 3. It doesn't crack or swell up. Seems to be very strong too, doesn't crumble or "sand". Problem is, the only place in town that sold it has closed down, and i can't get hold of it now. Any suggestions?