New Way Nike Ajax Build, Part 7, Filler/Primer

Note the edges at the top and bottom of the balsa adapter. You'll see a raised ridge of CWF.

I brush on CWF a little over the shoulder lip. While the filler is still wet, the adapter is slid into the tube and turned. This makes a raised bead of filler. 

When this is sanded with a block, it makes a more defined shoulder edge on the finished model.

All the sanded balsa pieces then got a fairly heavy shot of filler/primer.

The forward fin shows the filler left in the remaining balsa grain after sanding with 400 grit.

This is a two-step fill, CWF and sand then filler/primer and sand. There shouldn't be any grain left. Like anything else, a new technique takes practice.

Here's the booster BT-55 tube.

CWF was used first on the tube seams, followed by sanding.

On the right, the picture shows how much of the filler/primer is sanded off leaving the gray primer filling any remaining tube seams.