I have used butyl tape extensively where appropriate on my Gulf 32 Aeolus and cannot speak highly enough of the stuff. However, I can say with certainty that it is in no practical way an adhesive. If crushed into my non-skid it is a pain to get out, but will roll off of any flat surface pretty easily. It seals
well enough with mechanical fastening to not leak at all. Period. It does not dry out, and therefore does not require the removal
and rebedding of the hardware
as polysulfide does. No stink, no mess, does the job, and permanently. Can't beat that. I extoll the virtues more on my blog at Stories of Aeolus- Our Gulf 32 Pilothouse: I love Butyl rubber for sealing!