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That's exactly the reason I don't use this method, and haven't commented on it before. Nail polish remover is designed to soften and remove the nail polish, which, generally, is a varnish, often of a cellulose base, by dissolving it. This means that plastics will also dissolve, or at least deform, if the polish remover is dense enough on a relatively small and concentrated area (such as a joint line) or left long enough.
It is probable that in most cases, on thicker plastic around, say, a fuselage joint, and where the material is removed very soon after application, that damage will not occur. But, if left just a little longer, some deformation and or loss of moulded detail should be expected.
I've actually used nail polish remover to make 'liquid plastic', for casting a small part, but only once, as the control over the process is minimal!