Lots of discussion on topic of nails on Delcamp forum:
https://www.classicalguitardelcamp.c...forum.php?f=87
Here are a couple other threads from another part of this forum with a similar but slightly different topic, but includes many responses (including mine) about various products and techniques used for nail care:
http://www.acousticguitarforum.com/f...d.php?t=452910
http://www.acousticguitarforum.com/f...90#post5182590
https://www.acousticguitarforum.com/...d.php?t=483110
https://www.acousticguitarforum.com/...d.php?t=502259