Well, I obviosuly wasn't there, but since I do the walk around, I make the call and capts have always gone with my judgement. If I see frost, we get sprayed...period! Certainly if anyone in the crew had concerns, I would say do it also. Most F/A's are not pilots but I wouldn't do something that the capt was not comfortable with...F/A's are part of the crew as well. And not for nothing, Im pretty sure Cactus crews were paid by the hour back then!