Butyl Tape, what Sticks and what Quits | Sundowner Sails… 2 Dec 2012 ... One of our recent additions was two 50 foot rolls of butyl tape, ... Butyl rubber is a synthetic rubber, a copolymer of isobutylene with ... I've always read that on a boat grey butyl is the way to go. ... With high hopes I finished rebedding the genoa tracks and .... The teak battens are rotten and beyond repair.