Estes Boosted Bertha #001946 Build, Part 8, Fillets, Fill & Undercoats

When you get good at applying fillet glue you won't have much to smooth out with a finger.
The upper picture is the glue line applied,
the bottom picture is the smoothed fillet.
I'll usually do one fillet of wood glue, then another fillet of Titebond Molding and Trim Glue.

This isn't necessary but I went ahead and filled the joint between the booster centering ring and body tube.

CWF filler was set in the joint. After it dried I sanded it smooth with 400 grit. In the end after filler/primer there shouldn't be any line.

Here's the first white undercoat on the booster. The fillet ridges and glue boogers have been lightly sanded down.

I'm spraying the booster and upper stages separately.
TIP: To keep paint off the coupler, it is not glued in until after the final orange color has been sprayed.