"Yes, the FlatCat was colored with permanent markers. Before applying the markers, the glider was shot with a coat of Duplicolor white sandable primer, then sanded smooth with 400 grit paper. This 'seal' coat keeps the marker colors from absorbing into the grain and running. The white undercoat also makes the marker colors pop.
Since this model is being flown only for sport, I'm not at all concerned about any additional weight from the primer.
The glider that this one is replacing was finished in the exact same manner, and rode away on a thermal on its first flight (B4-2 motor). I had it in sight for well over 5 minutes before I lost it."
That's a great tip - using the white sandable primer before using the felt tips pens!
I've used felt tip pens on raw balsa before and the ink can run outside the desired
color separation lines.
Ed's Model Rocket Blog can be found at: https://castlerocketeer.blogspot.com/
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