Dave,
This is from Gary Hertzler Prop Care page "-Your Silver Bullet has a rain erosion leading edge, however, it will not often stand up to larger pebbles or cowling screws. Chipped leading edges or dings in the prop can be successfully filled with JB Weld. Thoroughly clean the area to be repaired with solvent to remove any traces of engine oil. Overfill the depression slightly and allow it to harden. Carefully file and sand back to contour." I've used it a couple of times.
Mike
VariEze 235
N840EZ
500hrs
KPAE