C
Corky
Well done Doug:hurray:well, was troubling me all night, so i rang british gypsum this morning, explained the scenario to one of their technical team who liaised with somebody else, who got back to me with "what was that failure thing called, never heard of it. It is a perfectly suitable medium(s/c) to plaster(skim) onto using their multi skim (which is what I use) as long as background is cured" so I can only assume that the boffins at BG have maybe added an additive to counteract the reaction!
And I want to be in bed before 12 tonight!!:hurray: