I am using West Systems epoxy resin, for the fibreglass work, and so I also bought some of their 406, filler and fairing compound, it’s meant to be really easy sanding and hold a feathered edge. It gets mixed into the resin to your desired consistency. Mine I thought was pretty thick, when I applied it, but after a few minutes it all sagged a little which means I need to add more 406 compound next time, but hey, its going to be sanded back anyway so it does not really matter.
A layer of light weight filler has been applied to the fairing
