I'm a paramotor pilot and from time to time need to repair the edge of a composite propeller. I already make repairements with poliester filling kits. But want to make it with the right material and
methodes. Don't imagine it like the propeller of an airplane. it's not dangerous to fly with it, because a paramotor flies with the wing. Motor and propeller helps it in vertical direction. I can fly and land 
safely even with a shutdown motor. Only thing what I have to care is the balance of the propeller not to damage my engine because of heavy thrilling and a comfortable flight naturally. What I am talking about is not big damages. But a few cms damage at the final edge which sometimes happens by touching the cage. A broken edge shortly.