leow90•21d ago

Deck stain failure after that humid spell in August

So I stained my backyard deck back in June, waited the full 48 hours like the can said, and it looked amazing for about 6 weeks. Then we got that crazy humid stretch here in Columbus, the kind where your tools rust overnight in the shed, and the stain started peeling in big flakes near the railing posts. I used a semi-transparent oil-based stain from the big box store, and I'm wondering if I just picked the wrong product for this climate or if I messed up the prep. The deck is 12 years old, pressure treated, and I did power wash it but maybe not enough time to dry before I rolled it on. Has anyone else had a stain fail like that after a humid spell, and did you sand it all the way down or just scrape and recoat? I really don't want to strip the whole thing again, that took me a full weekend and my back is still mad at me.

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janab8220d agoMost Upvoted

Wait, you POWER WASHED it and only gave it 48 hours in Ohio humidity?? That is CRAZY. Pressure treated wood soaks up water like a sponge, and that humid spell basically trapped moisture right under the stain film. Oil based stain needs the wood to be DRY, like actually dry, not just "feels dry on the surface" dry. I bet if you tap those peeling flakes you can feel dampness underneath even NOW. You are looking at a full strip, my friend, because scraping alone will leave that moisture seal and your recoat will fail in a month. Sanding down to bare wood on those railing posts is the only way, I learned that the hard way on my own deck two summers ago.