We've been experimenting with a new fingernail hardener/protector for the last couple of months. This is for natural fingernails.
This one is the best nail strengtheners we've ever found. Brush it on, it dries very quick, and you can add as many layers as you wish.
It bonds like no other hardener we've tried. Seems to become part of the nail. Makes for really strong, durable nails.
You can find it on our products page at guitarplayernails.com, here: https://guitarplayernails.com/index.php?cPath=65
As always, if you don't like it, we'll refund your $.