Sanding a carbon fiber prop is not a good idea because....Carbon fiber is a composite material with specific properties that make it stronger. Sanding this type of material does 2 things:

1. It produces tiny scratches on the surface. These scratches create areas of stress concentration. This may cause the prop to fail unexpectedly and catastrophically.

2. If you sand too much, you will cut through the surface binder/resin that holds the carbon fibers together. This may cause the same results as #1. The exposed carbon fibers are microscopic and very sharp, like fiberglass except smaller. The fiber dust or splinters could easily become lodged in your skin, eyes or mucous membranes. You may need to see a doctor to have it removed.

In my opinion, to properly balance any prop, you should spray a light coat of poly-u on the front side of the light blade. This does not compromise the integrity of the prop or alter the basic airfoil shape.

Dr.1