More on dull rasps; I made at least 145 bows with my trusty #49 cabinet makers rasp, I never thought about it getting dull and kept using it. It wasn't until I bought a new one that I found out just how dull my old one was. What took me an hour with my old rasp took me minutes with my new one, duh, my rasp went downhill so slowly I never noticed it.
Get a good rasp, you will pat yourself on the back for it later.