"Q: Is it allowed in Islam to say ones prayers with Nail-color on ?.
A: Praise be to Allaah.
It is permissible for a woman to colour her nails for the purpose of adornment, with materials that do not cause harm, and there is nothing wrong with her praying with that, unless it is a substance that prevents water from reaching what is beneath it, in which case wudoo’ and ghusl are not valid unless it is removed. If the wudoo’ is not valid then the prayer is not valid.
It says in Fataawa al-Lajnah al-Daa’imah, 5/218:
“If the colour is impermeable, then wudoo’ is not valid unless it is removed before doing wudoo’. If it is not impermeable, then wudoo’ is valid, as is the case with henna.”
You can put nail polisher on you nails after wudu' and you can pray with it but than you have to remove it before you make next wudu' which is a lot of work... I like to polish my nails but for this reason I don't so the only time I polish my nail is when I am menstruating and before I make ghusul I remove it