hi everyone havent been on here for a while...... question need help with please.... my mate had an extension put on his house 4 / 5 years ago maybe...... the plaster right in the corner of all 4 walls has cracked heavy..... i've scraped all the loose stuff away with knife and i cant see any trace of scrim tape????? should you always scrim your internal angles or are there times when you don't???? he wants it sorting but don't really know what to do for the best???? thick bead of caulk skim away from the corners and feather in??? scrim up the corner and skim away snd feather in???? just always assumed you would scrim up always????? any hows nice to be back and any help would be massively appreciated... cheers ;D