Can paint go off??? Short answer YES!!!! Updated..

Hello all,how are you on this wet ,windy and blooming typical Bank Holiday..
As you know i have plans to re do my downstairs loo..being frugal we decided to use up old paint..2 half tins of cream emulsion..it made one full tin of a gorgeous creamy paint.
My lovely hubby started to paint it and kept telling me it smelt funny but i honestly could only smell the paint smell.
Only thing i can say is as its drying the smell is almost silage not quite but almost..god help us when its totally dry..it hits you like a flipping wall of dung when you go in there..so now we are going to have to buy a fresh tin of paint..thank god we have some money is all i can say..if i had to live with that smell it would be bloody horrendous..and small children and animals would cry and run away..i want to as well.
So out come my paint charts..wish us luck with the smell its going to be embarrassing until we can paint over it..
sara

We have now got an onion in the loo to combat the smell..we have now hit that perfect blend of B.O..gawd its making me feel faint..hope this onion works..we need on the size of a dinner plate..