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I was thinking of 1/8" Luaun or baltic birch. I would like to use a clear coat or dye-stain plus varnish.

Yes there are a raft of types of plywood. Other suggestions welcome.

By dimensionally stable I'm most concerned about warp and twist.

Exposure is full sun for 2/3 of the day through patio door windows.

I'm looking for a combination of wood plus finish that may work for this.

I have to replace the blinds anyway. The old vert blind mechanism works fine. Occurred to me that I could replace them with vertical slats of wood. Now I've seen horizontal venetian blinds made with wood, but I don't know what they did to make them warp proof.

At one point venetian blinds were made of wood. How did they deal with the warp and twist problem?

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    Depends. "1/8 inch plywood" is a class of products. You need to be more specific. – isherwood Feb 17 '18 at 23:48
  • Applying finish will help. Also, where they hang and how much sun and humidity they get exposed to. You could also glue a few perpendicular slats that would help keep them flat, say one the top, one at the bottom and one in the middle. – Kokako Feb 18 '18 at 17:20

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