RE: CY Model SIAI Marchetti SF-260 87 inch Build
The fibreglass wingtips need to be glued onto the wings.
I started by removing the covering from the tips (leaving around 3mm around the edge). I also used some coarse sand paper to roughen up the fibreglass wingtip inside the area to be glued.
The kit also came with a set of lights for each tip so I ran the wiring through the wing before I glued the tip on.
Then it was a simple matter of mixing up some 30 minute epoxy and taping the wingtip in place while the glue dried.