The 24-hour dry time myth for polyurethane is killing me

Honestly, I keep seeing people slap on a second coat of oil-based poly after a day and call it good. That's a fast track to a gummy mess, especially in humid spots like my shop in Savannah. The can says 24 hours, but I've learned it needs a solid 48, maybe 72, to really cure before sanding or recoating. Who else waits longer than the label says?

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3 Comments

jason735mo ago

Ever try a dehumidifier in your shop?

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tylermason5mo ago

You know, it made me realize how much moisture a shop can hold. I had some old hand tools start to get a little rust on them last spring, nothing major but it bugged me. I ended up just keeping a small fan going more often and it seemed to help a lot. Maybe it's just me but I'm always worried about adding another thing that needs to be emptied or plugged in.

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hugo6453mo ago

Ah jason73, I gotta gently push back on that one. A dehumidifier can actually do more harm than good in a shop if you're not careful. They pull so much moisture out that wood can shrink and crack, and some glues don't cure right with super low humidity. A fan like tylermason mentioned is usually the safer bet because it just moves air around instead of drying everything out completely. I'd say stick with the fan and maybe wipe down your tools with a light oil after you use them.

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