Ebb,
Wow, did this thread get sideways. But I guess no testimonials for butyl tape - I will be using it in my spring fitout, and will let y'all know how it goes.
I closed on the sale of the Adele M last saturday, and am kinda stoked to get that steamy Flyer underway. But the Ariel still owns my heart.

Yes, I have used that product to which you refer. It is widely used by roofers and other scoundrels. But did you know it makes a great emergency patch for small boat hulls? At work, we sometimes use a small aluminum skiff to service piping in our channels, and awhile back one of our cherubs managed to hole the vessel, and to finish the mission we stuck a strip of that gooey stuff over the gash and viola'. And it is superb on roof flashing. But I think it is too soft for bedding.