That caulking is a type of seam sealer.  3M makes it.  Available at body shop 
suppliers.

Dennis

-----Original Message-----
>From:	vanagon@lenti.med.umn.edu  On Behalf Of Normand Gagnon & Sylvie Brunet
Sent:	Sunday, May 04, 1997 10:18 PM
To:	Multiple recipients of list
Subject:	Rust on seams

Today I had take a look over two seams that seems to have some rust
under paint. It seems that either VW or someone that had made a job
paint had put some caulking uin the seam. After I will have clean and
put some primer in the seam, will I have to put some new caulking, and
what is this caulking (silicon or what).

Thanks in advance
Normand Gagnon
NormandSylvie@ibm.net
Westy 85
Jetta 91