25
Am I the only one who ruined a project with quick-dry poly on a humid day?
I was finishing a cherry wood table last week and picked a quick-dry polyurethane because I needed it done fast. The air was thick with moisture, but I ignored it and applied the coat. It looked perfect at first, drying smooth in minutes. But when I checked the next morning, the finish felt dry on top but was sticky underneath. I tried to sand it lightly, and my sandpaper got gummed up right away. Now I have to strip the whole thing back to bare wood, which is a huge pain. This happened to me before with a different brand, so it's not a one-off thing. Always check your shop's humidity or use a slower drying finish when it's muggy, or you'll waste hours fixing it.
3 comments
Log in to join the discussion
Log In3 Comments
hernandez.morgan7d ago
Consider how humidity gets trapped between coats, not just during the first one. That sticky layer might be water vapor sealed under a dry top coat, acting like glue. I've had luck putting a fan directly on the piece to move the damp air away before the next coat, but really, a dehumidifier in the shop is the only real fix.
5
leowest8d ago
A buddy of mine was refinishing an old door last spring. He used a fast-drying varnish on a really damp afternoon. The surface seemed set, but it stayed tacky for days underneath. He ended up scraping it all off and starting over with a different product when the weather cleared up.
3