I used to put good sized fillets on centering rings when I was young and dumb. I stopped putting so much glue in and ended up with minimal shrinkage that a good thick coat of primer and a little sanding will take care of lickety split. If it's a little much for primer coverage, a little F'n'F or Bondo will take care of it. We're already filling seams anyway, right? (not you, GH)

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I love sanding.