It's variously called mastic, dumdum, Thykol, butyl rubber.  May have
different compositions but what they have in common is non-hardening,
non-shrinking etc.  The "tape" is a bit of a misnomer -- it's just a flat
line of the stuff wrapped on releasing paper.

Yrs,
d

On Fri, May 1, 2020 at 5:33 PM Steven Shelton <shelton4@gmail.com> wrote:

> What is the black sticky stuff around the bolts in the pop-top roof? I
> thought it was butyl rubber but the only butyl rubber I can find is tape.
>
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