Hi Violeta, I might be stating the obvious, but since you are planning to use butyl tape in the project, you may want to look for the good product (apparently not all butyl tapes were created equal).
One of the best sources of the butyl tape (if not the best) is Maine Sail (Compass Marine) (http://www.pbase.com/mainecruising/butyl_tape) – I have no association; only a happy customer. goof luck with your project Marek Dziedzic 1994 C270 “Legato” Ottawa, ON
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