With fibreglass, if they are thin and weak you can get some glass and resin and thicken them up. Then how thick and strong they are is up to you.
It's also worth putting something on the inside to protect against stone chips hitting the inside of the wing and making the star-crazing on the outside.
It's also worth putting something on the inside to protect against stone chips hitting the inside of the wing and making the star-crazing on the outside.