We bought some casein paint powder and have successfully painted a number of rooms with it. We have been very pleased with the results. Other things happened however while painting one room and we were delayed in finishing. Four days later when we went to finish it, the paint was quite smelly. We phoned the supplier and were told that it would be alright to use it as the smell would go "as long as you can take the smell while painting". This was not correct as three weeks after painting, the smell is still vile stinking of a mixture between rotten cabbage and cow dung. Is there anything we can do? It is a bedroom which adds to the problem.