I did both my grabrails with butyl a couple of weeks ago, used an impact driver to tighten them down progressively over the course of a long afternoon, then trimmed up the excess the next morning with a plastic razor blade.
The problem is that I am still getting a tiny additional bead of squeeze out after a day or two. I've cleaned it up three times now and it keeps coming back. You have to look very close to even see it, but it is enough that I think it will collect dirt over time, get on lines or gloves, and etc.
I covered the entire pad rather than just a bit in the middle as in the pic above. Is that the source of my trouble?