This may well be a daft question. I wallpaper-ed for the first time last weekend, was a tad harder than anticipated but in the end I triumphed thanks to adding a spirit level into proceedings to add to the plumb line (paper had a strong horizontal pattern in it). I have some leftover wallpaper that I would like to use in the back of a wooden bookcase. What glue would you use to stick it on? Options in the cupboard include strong spray glue, or PVA. I don't have any more wallpaper paste but am prepared to be told it has to be that. What would work best? All advice very much appreciated!