There are ready-made corner blocks available at every hardware store... They come in different designs too, probably don't cost more than 30 kronor each... I used them myself in the previous house when I installed coving in the sloped ceiling, unfortunately don't have any pictures, but it was very easy and turned out very nice too...
Otherwise, it would take a lot of sealant to get the corners right
Otherwise, it would take a lot of sealant to get the corners right
http://www.setragroup.se/upload/Bilder/Sagade_travaror/Produkter/Thumbnails/Hornkloss-th.jpg
Something like that, right?
Something like that, right?