Thank you for your comments. If you are a restorer then fine, in a hundred pens time you will order more. For the person who has been left his granddads pen then his wife's nail varnish would be more than adequate.
You know what is absurd and infuriating about such a statement? What happens when problems occur for the great-granchildren, or their kids? No, because someone gave idiotic advice to do a repair that is irreversible or has a high degree of risk for damaging the pen, the precious heirloom is now lost for use. All because some cheapskate wouldn't pop for a couple of bucks, such a pittance when compared to a valuable family memento.
Classic case of penny-wise, pound-foolish. I bought a jar of the sealant from Ron Zorn (because, look, let's all be grown-ups about this - that is who you are referring to). He has a well-established reputation, cares for the life and provenance of pens, and offers items like this to the rest of the pen world for very, very little money. I used the material probably three times so far, and I'll never, ever use it all. Nonetheless, the pens I HAVE used it on will never suffer the fate of a pen that has been hacked by an amateur with nail polish.
Please. If you don't have advice that doesn't harm the pen, don't give advice.