It's a mastic, has a vw number but I found what is called "Dum-Dum" sourced at rv store to be pretty good.

It doesn't harden up.

Alistair

> On Dec 21, 2014, at 11:22 AM, Marc Perdue <mcperdue@GMAIL.COM> wrote:
> 
> Hi all,
> 
> I'm busy putting all the parts back on my van and I'm focusing on
> getting it sealed up before any rains come. When they took the poptop
> off to paint it, the bolts that go through the top and into the hinge
> used to lift it were taken out. They appear to have had some kind of
> white gunk on them to seal them and prevent leakage. Any ideas what
> that might be or what I should use in its place? After the recent
> conversations about silicone, I'm hesitant to use silicone caulk on
> it.
> 
> Thanks!
> Marc Perdue