Yes, the same mastic used all over the top where there are penetrations. I prefer dum-dum to caulk in so much as it is easier to handle (doesn't get all over things) and it seems to remain soft and sealing.

There are bits of mastic under the extrusions where the extrusions go over the raised sections of the roof. Fills in the imperfect match of the extrusion curve.

alistair
On 2013-03-05, at 11:09 PM, neil n wrote:

> Is that stuff under the aluminum strips the same as what Westfalia
> used to seal the luggage rack brackets etc. ?   I imagine so.
> 
> The white caulking at those points was still soft. To be thorough, I
> removed all the parts, cleaned etc. I thought I'd seen something
> similar used in marine applications so used this
> 
> http://boatlife.com/life-seal/lifeseal-sealant-tubes-3oz.html
> 
> I'm sure it'll seal but have to wonder how pliable it will remain.
> 
> Didn't know of "dum dum" caulking or was aware there was any caulking
> at those strips. Thanks.
> 
> Neil.