I finished pepping the helmet on Saturday. Today we picked up some vinyl gloves, brushes, and plastic cups and I started fibreglassing the top of helmet. The resin I had was a bit old and it was a bit chilly today so I had a few concerns about it not curing.
I has been a few hours and it seems to have mostly dried but it is a bit tacky still. I brought it inside to see if it will cure overnight. I can then harden the rest and lay in some fibreglass mat inside.
It's promising. If this works as it should, then this opens up many options of what else can be done.