I recently sized new plaster in my bathroom with a weak wallpaper paste solution. However, I now have many areas that look like crazy paving. Rubbing lightly with sandpaper and repainting has not cured the problem. The bathroom has no heating at the moment so the paint cannot be drying too quickly. Any solutions?

Not the answer I wanted but I did think it would come to scaping and sugar soaping the walls. Thanks for info. Elbows and arms now suitably sore. Won't make that mistake again!!!!