If you can feel the body tube seams with a fingernail, the seam will show after color coats are applied.It's hard to see the seams, especially on the white tubes.
Lately I've been dragging a mechanical pencil point down the seam to see it when applying filler.
Seam filling CWF is mixed a bit thicker than the filler brushed on balsa.I dip the tip of a dull knife in thinned CWF.
One side of the blade (facing away in this picture) is wiped off on the lip of the filler jar.
Drag the drop of filler down the pencil marked seam.
Do an inch then dip, wipe and drag again.
It looks like a lot but you can apply seam filler down an entire body tube in a few minutes.
Mentioned earlier - Use filler mixed slightly thicker for tube seam filling. Thicker filler has less thinned out glues. CWF used in filling balsa is thinner and brushed on.
Let the filler in the seams dry thoroughly overnight before sanding. It might feel dry, damp filler won't stay in the seam.
When sanding, sand up and down the length of the body tube.
Don't sand around the tube over the seam. That can knock the filler out of the seam!
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