Amongst my last parts shipment from Vans was a bag of cotton flock that I'd ordered, for adding to resin to thicken it and make it more workable. Today I mixed up some resin, added cotton flock, and applied to the holes that I'd incorrectly drilled in the right wing tip.
Once this has set hard then I'll sand back flush. Then I can reposition the wing tip, properly this time, and redrill new fixing holes.