Ii recently purchased "flex all" all purpose putty to use for smoothing out airframes on my rocket. I just used some to fix a chip on my nose cone and it worked great. It dries to become rock solid but easy to sand.
Here is a link of the product. However, I purchased it at a local Denault's hardware store. I bet your can fill spiral grooves because it does sand pretty easily and might be even easier to sand if mixed with some water.Can you use it to fill spirals on body tubes? Do you have a link to the product? I know some people use the green squadron putty to fill nose cones and body tubes.
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