Where my chain plate goes through the deck, I made a small bevel in the resin around it using a Dremel, then used thickened West System expoy and it has worked extremely well. Note that this fix is not flexible, so no use if there is likely to be any movement. In that case Fixetch might be the go, or a bonnet screwed to the deck, with butyl under it.
I have used butyl tape for all sorts of other deck bedding but it's not an adhesive and does require compression form screws, bolts etc. I would avoid the stuff with the integral webbing - that's only needed for long runs, and would get in the way for small deck fittings etc.
Have a look at this link - I've followed his method with 100% success over many years:
www.sailnet.com/forums/gear-maintenance/63554-bedding-deck-hardware-butyl-tape.htmlCheers, Graeme