Join Date: Nov 2015
Location: Wrangell Island, Alaska
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Re: Thru Hull Sealant Question
We just finished our haul-out and installed one new through-hull using 3M UV4000.
I keep it on-board because it can be use above and below the waterline, and because I have successfully had an open tube stay viable for over 3 years by storing it in the freezer. [Thaw and bring to room temp before use...]
This stuff costs us over US$30/tube up here so long term storage of partially used tubes is important...
I have also had great success with 3M 4200, but haven't had occasion to keep an open tube in the freezer to determine if it stays viable... [It likely will...]
In case this is helpful.
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