What kind of glue? Polystyrene cement will damage the surface of the model, and your best method would be to sand it off with light weight paper, then make good if necessary with putty. Superglue might chip off, or lever off, especially if you freeze the model. Be very careful when you use a knife or other sharp edge to try and chip it. Priming over the glue won't work unless you can print it or disguise it in some way as battle damage, mud or something. A good primer creates a very thin layer over the underlying surface and will let any small detail come through.
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