I have been scraping the paper away where the ceiling meets the wall and a lot of rubbery (caulk/silicone?) came away as well. Because it was hanging down, I pulled on it and in one area (in the other areas there is a gap of around 4 mm wide) there is a gap of around 7 mm wide by around 1 cm deep. What came away, was very hard and rubbery - would this be caulk or silicone? I need to get the room totally finished by the end of the week, so have no time for getting in a plasterer/builder to sort this out. What can I use to fill the gaps between the ceiling and the wall, and in particular the bigger area of around 7 mm wide by 1 cm deep? Could I push paper into the bigger gap and then use a caulk on top, or would something like polyfiller be better to fill the bigger hole and then top it with caulk? Also, I will be using a patterned wallpaper on the walls - would it be better to put the paper up - so the edges are hidden in the gap (to give a neat edge) and then use caulk afterwards to fill the gap between the ceiling and wall? Any advice appreciated. Thank you.