RE: prop balencing?
Never repair a prop.
Go out and get a composite prop - I recommend Master Airscrew for beginners because they work well and they're cheap.
Scrape or sand the TE of both blades to remove the sharp flashing from the mold or they will slice your fingers up if you flip the prop by hand (Even if you're not trying to start the engine).
If you really want to balance the prop, get a prop balancer. Anything less and you might as well not balance it - Which I wouldn't bother doing on a 10" prop anyway.