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?