I’ve used stretched sprue along joint seams. Saturate just the stretched sprue with liquid glue (be careful not to get glue runs onto the model’s surface) and when it’s soft squish it down flat and firmly into the joint. It helps if you use sprue from the same kit so that the plastic is of the same quality and color. Leave it overnight to completely set up. The next day it should be solidly welded to the model and have become part of it. Sand and polish smooth.
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