Advice needed. I sanded the tops of these kiln dried rounds and then coated both sides with shellac. Most of them split a few days later.

The untouched rounds have been stable.

How can I make these smooth and shiny and keep them intact?

    • jadero@lemmy.ca
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      1 year ago

      While you’re at it, maybe plane or scrape a couple of rounds, too. If sanding marks and raised grain really do increase the exposed area, getting rid of them will reduce it.

      I would think someone out there has already done the experiments, but I didn’t find anything with a quick look.

      Also, if you’re not committed to shellac, there are coatings that are less permeable to water vapour.