On the forums I've read where first time builders question how grainy the filler is. Too many try to use it full strength the first time.
Here's a good starter mix ratio of CWF and water: CLICK HERE
The inset picture shows the same fin after sanding. You want to leave a very thin "skin" of filler on the balsa surface.

Here's one of the smaller rear fins after the Duplicolor Primer/Filler was sanded down. Look close and you can see the line where the fin was pieced together.
Before filling the body tube seams I trace down the seams with a mechanical pencil. It's easier to see the seams with the contrast of the pencil line. This BT-60 tube was wrapped so well there wasn't any seam for the pencil tip to follow!
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