Is the idea for a can of whipped cream that has the ability, upon activation, to near instantly fill any enclosed space as long as its disconnected from the outside world already taken? I dunno, it seems like something that would be taken…
Don't think so.
But what's the story? A SCP generally needs more to it than just "A Thing What Does a Thing (and might kill you)". SCP reports are stories in the form of reports on objects.
On its own, this idea is boring. So you need more to it under the hood for it to be made interesting. Who made it and why? Does it backfire horribly in a way that is not immediately apparent? Where did it come from? What is that society like? Answering any of these will help bring your idea to life.