Here's a really short explanation of when to use quotation marks:
- around dialogue, such as:
"The store is open," he said.
- around words which might be unknown (or used in a way previously unknown) to the reader, such as:
When we're talking about a store being available to the public, we refer to that store as being "open" - though its front door may not be standing open, or it may not have a physical door at all.
- around words which might be facetious, where "air quotes" might be used if you were speaking, such as:
They say the store is "open" 24/7, but apparently that's only true if you know the owner.
Here's an even shorter explanation of when not to use quotation marks:
I saw that sign on Thursday and I'm still not sure what they were hoping the quotation marks would signify. (I also wasn't immediately sure what "open-remodel" meant, but at least I could figure that out via context.)
Even more confusing to me is the fact that it is a professionally printed sign - not just something someone dashed off with a marker on whiteboard - which would indicate that the writer was pretty darned sure it was correct.
If you're ever not sure about the use of quotation marks, shoot me a message. I promise not to be "too" snarky when I reply.