I've spent the last several weeks re-bedding a lot of hardware, removing deck coring, filling with epoxy, re-drilling fastener holes, and remounting with butyl tape. In the past, I've used other products, but I'm now convinced butyl tape has to be the easiest product Iíve ever used.
Now it's time for the chainplates, and my concern is getting enough butyl tape below the deck and between the chainplate-deck gap without enlarging the gap too much. My thought is to heat up both the chanplate and then wrap the butyl tape on, heat the tape, and the slide the chainplate from the top. I could then try to pack more butyl from above. The other option is Boatlife, which is more viscous.