Here is where it gets really ugly. The water inside the wood starts to escape.
As the wood dries out over weeks, it shrinks. Your stain, trapped on the surface, has nowhere to go.
It cracks. It peels. It flakes off like sunburned skin. You will be left with a tragic, spotty finish.
Frankly, it looks like your deck has dandruff. Not a good look for your backyard.
The Mold’s Best Friend
Here is a weird fact: trapped moisture creates a perfect hotel for mold. Those peeling cracks hold dampness.
Your shiny new stain job becomes a black, slimy science experiment. You paid for "deck stain" and got "mold farm."
You will hear a funny sound: the squeak of regret as you scrub black spots next summer.