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RE: Prevent Wood from Cupping5/12
If we have a piece of poplar or oak wood, 10" wide x 10' long, and a 1/4 " full thickness to finish, with a stain or dye and a light sheen finish on it, what do we have to apply to the back so it will not "cup" and lay flat?
I have two artistic pieces of wood that I want to apply to a wall.
Finish the board on both sides and all edges for each step in your process.
You can usually do one decent sealer coat on the backside. We would typically use Sealcoat shellac. Finish top and edges as normal.
You are simply trying to make it as moisture proof on both sides. If 1 coat seals the wood. Adding 2 more coats does nothing in that regard. Do not worry about creating an unbalanced panel. Meaning: 1 sealcoat on both sides. 2 more finish coats on 1 side.
The best is to do equal finishing on both sides. But that doesn't mean you need to scuff sand to perfection.
Myself I'll just do a thick coat on the back side and it's usually good enough. But with wood that thin you might think of going the equal coats way.