Goony X-15, Part 7, White Undercoats And Sanding

Grey primer really shows off all the rough areas a glue blobs. The follow up white undercoat shows off even more.

Check out the rough fillet area under the strake.

Trying to apply a glue fillet in the very tight back fin angle is very hard to do. Sometimes I don't bother with it.
The same goes for launch lug fillets. It depends on how tight the angle is.

I've sanded down the rough fillets with 400 grit. Another white coat will follow.
This one will be easy to paint, it's all black!