What is the ruling on using nail polish instead of "manicure" (nail polish that forms a layer)? And does it invalidate ablution?

There is no objection to a woman using nail polish instead of nail polish, unless it is made of an impure substance, in which case its use is prohibited. If its use is permissible, it does not invalidate ablution, but if it forms an insulating layer that prevents water from reaching the nails, it must be removed before ablution.