DIY Doctor UK DIY Forums

hi guys i have a small area to plaster and i have some left over multi finish which was opened about 2 months ago...i mixed a batch today but it keeps going hard after about 10 minute in the bucket....i think i know how to mix as you put pour the multi finish into the water and mix until it becomes workable..so what am i doing wrong....? could the plaster be off?
advice please...cheers in advance!

geezer01,
Plaster has gone off, although you may have stored in a dry area moisture from the air will have probally had an effect.
KB