In my limited knowledge Nail polish is not allowed becoz it makes a coat on your nails and does not allow water to reach there.And so,you are unable to make wudhu properly.But i dont think its haram.You can use it after having done with your prayers and remove it before next prayer :statisfie
thank you..my muslim friend wanted to know this actually. She wears a scarf all the time,but she wanted to colour her hair (loreal excellence creme),its burgundy brown. Just for the fun of it. Not henna. Is that ok?