We started that morning, by filling the seams in the fuse between the planking.
Tim prefers the balsa fillers available from the hobby stores – especially the tinted-color variety; but lately, I tend to use Red Devil’s Onetime Lightweight Spackling as a balsa filling material. It is readily available at local hardware stores, and is far less expensive. Below, Tim is forced to use my spackling to fill in the seams of the planked fuse.