sig king kobra wings
I would use Z-poxy finishing resin and micro-balloons. Mix some Z-poxy then add micro-balloons untill you have a thick mixture. Then trowel on and force into the cracks. Wipe off the excess with a putty knife or old credit card. Let dry overnight and sand smooth. Easy to work with and will be an invisable repair. Enjoy the plane it is AWESOME. Wish I had retracts on mine. Also beware of the elevator throw. do your initial flight using sig's rec. throws and you will have no probs. Use to much elevator and it will high speed snap. One of my favorite planes...enjoy !!
good luck
Brian