How to preserve wood slices?
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Marsha
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If from a freshly cut tree or limb, they need to be "seasoned" for 6 months up to a year before using. After that you can seal them. Type of product to be determined by type of use.
Once they have dried out, you can varnish or poly. We cut slices for our daughter's wedding and let them sit for 3 months. We didn't do anything to them and afterwards we burned them in the firepit.
Varnish, Helmsman Spar Urethane, shellac. If raw fresh wood seal cut sides with one coat of polyurethane to slow the drying process so they don't check or crack for a few months.
Varnish them
https://www.hunker.com/12004005/homemade-wood-preservatives