Run out of scrim today prior to skimming a ceiling nearest merchants was b&q so shot down there whilst I was there I started reading there plasterers guideline chart for Jo public to follow. It said each bag of multi finish would cover 2.75 meters squared what? One bag for 2.75 meters thought I'm not reading this right shouted my mate over he read it the same. The ceiling I was doing was around 27 metres so that's about 9 bags according to them. It took 2 where do they get these figures from so Jo public not having a clue wud work it out and probably buy enough skim for the whole house when all they wanted was enough for one room lol so anybody who has a customer who insists on buying there own gear send them to b&q and to look at chart and you will have enough gear for your next two jobs for free . Also it said thistle bond it same coverage per tub eh !!!! If me and my mate are making a mistake please let me know or have a look when your in there!