New Way N-21 Sky Fighter Build, Part 3, Smoothing & Filling Tubes

This square tube didn't have any recessed seams. There was a 1/8" overlap of the outside layer.

I sanded down the raised overlap layer with 400 grit on a block. The corners were hit with some sandpaper over a fingertip. This left the tube rough with plenty of fuzzies.

The seams didn't need any CWF fill. The tube should be good to go with a shot of filler/primer and sanding.

The small square launch lugs had a seam, shown on the left.

On the right is the second longer lug after sanding and removing the ridges with 400 grit. 

The four lugs (two smaller and two longer) needed a brush of CWF followed by sanding. 

The picture shows the lug after sanding just the flat sides.

The corners still show a visible seam. This will need another small CWF fill.