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How would you seal this gap around kitchen sink plumbing?
(sh.itjust.works)
This is for a rental unit, so I'm trying to keep the cost low, while also sealing it away from silverfish. I have very fine steel wool on hand as well as a tube of DAP ultra clear flexible all purpose sealant.
Why are you avoiding the landlord?
I'd be pretty adamant that insects are entering the property and they need to come out and spray and seal it. It's his problem to fix.
You could get some duct tape and thick plastic sheeting like people use to seal broken windows. Just make sure it doesn't melt from the hot water pipe.