If you haven't already fixed it - I'd put some cynoacrylate adhesive along the crack after sanitising and allow to dry before overlaying it - it will stop acrylic potentially seeping through (overexposure, blah, blah).
This will also reduce any pain you may have as well. It is fine to do this - Geeg told me to fix an acrylic overlay on a fingernail like this AGES ago and it worked a treat and the pain was reduced immediately.
Stings like a ***** when you santise though so remove small children from the immediate vicinity to protect them from the swearing!