How would you seal this gap around kitchen sink plumbing? ( sh.itjust.works )

pigup , 8 months ago

If I’m being a cheap ass but also worried about fire I would get fire resistant big stuff and fill it up. may have to wait till one layer cures to close the gap enough for a second layer and then cut some sheet metal and make a crappy escutcheon type of thing to slap on top of it and call it a day