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The masecraft paua and abalone shell lvs is air tight. If not familiar it's a thin veneer sandwiched between clear and solid color acrylic. May be too thin to compare to your application.

When...

When keeping it open to breath, keeping one side exposed and one side covered would be ok?

Thinking of a piano key as an example where only one side is left to breath. If it is important to...

I look forward to find out what you learn, and see how you are able to recycle those broken pieces.

Right now I'm experimenting with epoxy resin on bone. In this case "art work" is being painted on the bone, and want to leave a protected finish.

I agree in normal application, the natural finish...