What is the purpose of sanding the fillet under the cockpit coaming? Is it to smooth it out? Is it to make sure the epoxy will stick to it? I did apply the fillet and it has been over 24 hours so it is now fully cured and I believe the next step is to sand it, but I am not sure how much sanding to do. Just to smooth the sharp edges or do I sand it all, even the already smooth areas? Thank you very much for your advice. Diane
It’s to make it smooth. A smooth fillet does a better job of eliminating stress concentrations. It also doesn’t snag any glass cloth that may come into contact with it.
Dowels or pencil-sized sticks of foam can be wrapped in sandpaper to make sanding tools that fit under the coaming.
Laszlo