Last week I placed two layers of fibreglas cloth inside the wingtips to reinforce the joint between the tips and the insert for the covered lights. This weekend I started working on the filler to smooth out the transition between the wing tip light assemblies and the tips. I'm on the second cycle of fill and sand, with another cycle or two to go. I wear a Tyvek suit, gloves and a respirator when I sand, as the dust isn't good to breath, and too much skin exposure will apparently promote an allergic reaction. That whole get-up gets pretty hot, so I arrange my schedule to do the sanding in the mornings.