Unless you get your wood from a saltwater area I don't think you need to do anything but clean it up. I have many cypress wood mounts and have not had a problem yet. I've used Sphagnum moss, Coconut husk and nothing at all on my mounts and all work just fine. I've mounted Phals, Oncidiums, and Catts. The shell sounds cool too! Just make sure the roots don't sit in water. Good luck and looking forward to some photos.
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"An orchid lover and their money are soon parted"
Dave
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