Hello all, I recently purchased a condo, and upon moving in found a 1.5" hole through one of the walls (picture attached) that my house inspector apparently failed to notice. The hole goes from my living room straight through to the outside. I'd like to repair the hole, but I'm not sure what to do. I found this stuff at Home Depot that looks like caulk, but is supposed to be for repairing masonry cracks. Would this work? I don't have access to the outside of the building (I'm a few stories up), so how should I keep it from coming out the back of the hole as I fill it? Any thoughts on what else I should use? It's worth noting that I have no experience with masonry projects. Thanks for the help!