Citadel super glue or plastic glue?
Green stuff and super glue dries quickly, but forms a very brittle bond. If you're going to use green stuff, let it cure naturally and you'll get a strong bond with a bit of flex to it. You can reduce the brittleness of the green stuff by using less hardener.
Plastic glue and Humbrol model filler might be a better combination. I used a tiny amount for some tricky parts on my skeletons. If there's any visible filler, it files and sands down nicely when it's dry.
Another problem is that some people prime their models on the sprue before assembly. This can cause the paint to interfere with the plastic glue bond.
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