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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.
I work in the power industry, we use foam to fill ducts. The inside of the duct is filled with little rubber tubes (I think 1" diameter, maybe smaller), these provide structure for the foam to fill bigger holes. Without that though it isn't suitable.