Good question. That all depends on the level of damage. Some propellers are so badly damaged that they are no longer repairable, For example: if half the blade is missing entirely, this can't be repaired. It's just too much material to replace. And with today's labour costs, sometimes it's not economically feasible to repair your propeller, if the new replacement cost is less than the repair would be. Sometimes a propeller just can't be fixed.
So my recommendation would be to contact a "Certified" NMPA repair facility in your area to get the best information on your particular needs.