Thanks guys, it shook me up a bit, thinking what other places have been done dodgy, you know how it is, getting all worried about vents, water TDS, was it too windy that day, just checked it was in fact 12 days ago.
Anyway, nice to know it happens elsewhere, perhaps its because usually I do the insides when I do the outsides, but on this ocassion its12 days later so they're beginning to look dodgy.
Thanks, I'll sleep better tonight.
Matt