As a late starter, I've been trying to use coloured and clear polish on my nails but I find that it seems to make them crumble quite badly. Granted, I use low-cost polish but I don't think that more expensive brands are necessarily easier on keratin. I use only acetone-free polish remover made from ethyl acetate and isopropyl alcohol. Can someone advise me? Perhaps my nails are simply unsuited to being painted; after all, it is apparently the same basic substance as is used to paint cars.