When the whole kit have its colors I have noted that ventral fin did not set up properly to the bottom, it have visible gap. So I have to remove it, sand it again to clean up surface and then sand it to make precise contour. After dry run I have cement it with liquid cement (work excellent). During the nervous maintenance with kit I have also crashed radio aerial under the wing so I sand also place around it position and place it again. Hope that further build would be without problem. But better to ask- did any of us ever have absolute smooth build, without any traces of problems or nerve tensions?