Can you post a photo of the part of your blade that you are talking about. Trying to give advice on this is not that different than trying to give advice on anything when you CANNOT SEE THE ACTUAL ISSUE.
But one thing is for sure, SEALANT WILL NOT GLUE SPLINTERING PIECES OF WOOD BACK ONTO THE BLADE FACE. However, wood glue might.
You also may need to glue and
CLAMP the area that needs to adhere to the blade.
Most of the stuff being asked in this thread are common sense wood working issues. You could find someone who is a carpenter and ask him all the questions you wanted in person. Someone who knows wood working would know the answers to the issues and questions in this thread.