Why cant or shouldnt muslim women wear nail varnish?

Muslim women can wear nail polish but she needs to make sure that while making wudu (ablution) there is no nail polish at all. because while making wudu, water should touch your skin and should reach to every corner of your hands, nails, fingers..... and nail polish is a barrier to water reaching to skin. Remove nail polish prior to wudu. once you are done making wudu, u can appply nail polish.. BUT if the wudu gets broken, then you have to remove the nail polish compltely and carefully, make fresh wudu and so on...~!