It was caulked the next day. It was definitely dry. He knows it's normally for that but the paper was so thick. It did say on the manufacturers instructions so that's what we did. It's had 2 coats now so not sure another coat would make a difference that's why I said about an undercoat or primer.
It was used to even out the edges of the paper where it joins as the paper is 5mm thick. In some parts it's fine it's just you can see the fine cracks on parts of the main wall.
hi my husband has recently has recently papered our little boys room with a thick insulating paper as he was a really cold outside wall. He's caulked the gaps then painted it with a dulux Matt paint. It cracked in places just on the caulking so he gave it another coat and its still cracked. Plus...