Every modeler has trouble with bubbles in the glue fillet surrounding the launch lug.
The angle of the lug fillet area is much deeper than a fin root/body tube joint. Bubbles seem to show up after the lug fillet is dry.
The simple solution is multiple glue fillet layers.
The picture shows the Big Girtha launch lug after five fillet applications.
When that first fillet is applied, smooth it out with your finger and watch for the bubbles to form.
TIP: When the glue is still very wet, pop the bubbles with a toothpick. You'll just have to try it, a toothpick tip will easily pop the bubble. Using the tip of your knife to pop a glue bubble will take too many tries. It's much harder to pop a bubble with you knife tip.
If the glue is still very wet, the hole where the bubble was will close up on it's own.
I know five fillet passes sounds like a lot, but each pass dries faster than the previous one did. Each new glue layer is much thinner than that first deep fillet.
X-actly what I do. But I've never seen this written down. Good one!
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