I was curious if anyone has heard of a sealant for a stern tube packing gland for when you are changing out rings of packing. I work for a small tug company and while talking to another Fleet Engineer in the area he was talking about a product that Devcon makes and it is like a soap? you whip it up and it thins out, then you pump it into your stern tube and it hardens up until the shaft starts rotating and it frees back up and just works its way out of the stern tube. I cant remember the name of the product or if there is another company that makes something like that. We have a tug that we have to constantly pump the stern out of the water to change packing or add a ring. Real pain in the ass and if there is anything that will set up temporarily and wont damage the cutlass or packing.