How to make billboards waterproof if they are made of wooden boards?

What should I do if I have to paint the wooden board with words carved on it?
Try my method, first spray the wooden board with primer, then scrape a layer of water ash, the water ash color It can be the black you want
The water ash cannot be mixed with paint, otherwise it will be difficult to remove. After it is dry, you can sandpaper it, because it is water
The gray is not sticky to the primer next to it, so it is easy to apply. You also need to apply the inside of the words. After applying, spray the topcoat.
It’s that simple, that’s what we do.

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