I’m currently replacing the Mylar (Dura-lar) water seals on the bottom of the hulls below the centreboard boxes . Is heavy duty contact cement the best adhesive for this job o is there something better?
I've used Goop. Don't let it skim-over before you put the tape on.
I have an article saved somewhere that gives more details; will see if I can find it. I think you'd want to use something like Sikaflex.
I'd go for what's known as a half gasket, much cleaner, but a little more work the first time you do it.
https://drive.google.com/drive/folders/0B2jHf8coA9KibTU5Q3V4VnBFd1U
I have been using HD contact cement for a decade now, as does everyone i sail with whom has a centerboard (about 10 of us). some have tried to epoxy them on ... makes removal a 1000x harder
i do sometimes epoxy the tips so they don't peel up
works fine
i use a water proof one from a local gel coat company, i would not be surprised if it is just private labeled
https://www.fgci.com/item/129072/FGCI-Contact-Cement-Brush-Grade-Clear-Quart-High-Strength/