Real talk - Is oil based polyurethane waterproof?
You're probably asking is oil based polyurethane waterproof because you've got a project on your workbench that you really don't want to ruin with a spilled drink or a stray rain shower. The short answer is that oil-based poly is one of the most water-resistant finishes you can get your hands on, but there's a little bit of "it depends" mixed in there that we should probably chat about before you crack open a can. ...