omg I don’t know!
I just bought nail glue from Sally’s for like $1.30
it’s called Beauty Secrets Quick Dry Nail Glue
anyway, I just put it on, but I’m not sure if it’s gonna work… it ~seems~ to be working though because the nail looks smooth where the crack is, but I’m putting two coats of base polish on just to be safe!
if you don’t wanna try that, there’s another trick I heard a long time ago, which my friend Kerri just suggested to me
you cut a piece of tea bag paper, put it over the crack, and then apply a base coat, and it’s supposed to help keep it sturdy
I’ve never tried it, so I dunno if it actually helps haha
sorry I hope I was helpful! I know how upsetting nails breaking/cracking can be (especially since mine are usually long~)