Estes Black Brant XII, Kit # 9723 Build, Part 17, Filling & Filler/Primer

I'm brushing on a single coat of CWF or Carpenter's Wood Filler.

Be careful to keep the filler off the root edge. I brush on the CWF but stop at the edge without lapping over on the root.

Use a fingernail to remove any filler and square up the edges.

The CWF was sanded to surface. 

A follow up spray of filler/primer followed.

After sanding down the filler/primer - 

Notice the high point at the center of the fins. If carefully sanded, the filler/primer can help define that line one last time.

Here's how I taped the pieces down for the filler/primer and white undercoats. 

If you spray from the angle in the picture, you shouldn't get any spray paint on the fin root edges.