I like the Bed-It Butyl product. Bought a binnacle guard at a consignment shop first year I got the boat. Attached it to the cockpit deck using bed-it to seal the deck through holes. It was a leap of faith in to the unknown. But I followed the recommendations and out sailing. About 16 months later I had to remove one of the binnacle bases to install auto pilot wiring. The bedding material had spread evenly sealing the bolt holes. With all the bolts free the base was still securely attached. It took some effort to pry//lift the base from the deck. The base came away with the same sort of material strings in https://marinehowto.com images. Showed me that the product was still flexible yet sealed. A desired result to an accessory that is used as a hand hold when in boat is bouncing about in chop.
