I also recommend ONLY Silpruf silicone. (AS did GE, to be used with their Lexan
products) It comes in colors, and when I used it, had to be ordered by the case of 12 tubes. We used it on ALL of the ports
on our Searunner
, as well as the dodger
, 16 years ago, NONE have leaked.
With plastics, bond is not as important as flexibility, because plastics expand and contract
at several times the rate of the rest of the boat. Unlike every other silicone I have used, Silpruf gives WELL over 30 minutes of working time. That alone makes it SO much better than the hardware
store stuff. It has a shelf life, so sell or give away your left over tubes!
About your halyard
restrainer chafe point ... I would swap out the halyard for a smaller dia. but MUCH less stretchy halyard of N.E.R.'s T-900. At the area where it goes through the restrainer, and say 3" above and below, I would put a 6" piece of Anchor
brand THICK "battery wire" adhesive
lined heat shrink tubing. (in black)... This has worked for me as chafe protection, and the lifespan is over 10 years!
On your roller furling
halyard, the use of a line like T-900, which to thin and stiff to be easy to work with, becomes a moot point, because you only use it twice a season, (to install or take down your jib).