What is the best product to smoothing/patch joints on hardie columns?

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Obviously not whatever the carpenter used here- but he can’t remember if it was a DAP or Quickcrete product. This was done about 5 months ago and been sitting. Client is SUPER slow in decisions so this hasn’t been painted yet. We are wondering if it would have held if it had been painted timely. Bondo usually looks worse than the gap after paint due to the super smooth texture contrast. This product did seem like it would blend texture wise. submitted by /u/WalterEGough [link] [comments]