Sanded down the epoxy primer that was squeeged over the dry wall compound with 320 wet/dry paper used wet. The epoxy converted the dry wall to a hard filler. What is a filler but a binder and talc. Came out very smoth with the pinholes and fiber weave clearly visable as gray dots or lines.
Sanded the cabin top and the doors. Taped and papered the airframe to put the next layer of epoxy primer on with a spray gun. Will completely cover the front skin and about 2" of aluminum outside of the fiberglass fillers. Completed the taping.
