re: nail polish and Mikveh ladies

Question

My experience in several cities throughout the USA is that if a woman wishes to follow a Rabbi who holds differently than the Rabbi who is supervising the mikveh, she should have her Rav clear EVERYTHING in advance with the Rabbi who supervises the mikveh. Additionally, she should make sure that the mikveh attendant is instructed by the supervising Rav that this is the correct way for this woman to hold. If possible, I usually recommend that a woman request that her Rav write a letter stating that ie "it is the custom of our community to permit nail polish" to the supervising Rav with a "cc" to be kept on file at the mikveh and that should there be any questions about this or any other customs in our community that "you can feel free to call", in case there is a substitute attendant on duty. It is sad that such a thing should be necessary but few attendants seem to understand that their position is in helping the immersing woman fulfill HER mitzvah. When visiting another city, I personally just find that it is easier to just go along. But in a city in which a woman lives it should be reasonable for a woman's Rav to inform the supervising Rav of the correct procedure for her. (Or build another mikveh which might be easier). I have personally seen (unfortunately) mikveh ladies deny immersion to women for reasons varying from wearing a chenille snood to nail polish (on Shabbat) to "not being a member of an Orthodox Shul". In each of these cases, running to get the woman's Rav, calling the Rav, combing, pleading or begging would not convince the attendant that it was okay for the woman to do tevilah. I have encountered very few people who understand that different communities and different Rabbis hold differently on many issues of halacha. I guess we need Moshiah!