Should I seal the concrete before start?
When I papered my boy’s room the concrete floors were already sealed, so this issue didn’t even cross my mind. Then not long ago I had a reader e-mail me and said she had papered her concrete floors and it was a wrinkly disaster (feel free to leave your story in the comments Lizz!). She later discovered was because the concrete was unsealed and ended up having to tear the whole thing up (which wasn’t easy). I felt SO bad. While I was experimenting I decided to try this for myself and papered two concrete pavers, one left raw and one that I put a coat of poly on first. The one with poly went on smooth, the one without went on a wrinkled up. It stayed that way for a few days, but then laid down flat and looks just like the sealed one. This is one a rough porous paver though, so that probably had a lot to do with how mine dried. Anyway, I would seal the concrete first. Trust Lizz.