Thanks for the replies.  Seems to be the stuff.
Available on Amazon for £20 plus £27 shipping ! 
Found some 08568 in the UK , as far as I can tell it is slightly smaller in diam. compared to 08578.
stuey
 

I use that as well, and have for 40 years. Used it when I rebuilt the doors/windows/etc a couple years ago, Its also between the frame and belly pan on my roadster. Cheap and it works. You can cut a short piece and roll it between your hands till it’s like thin spaghetti, then form it around parts as needed.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

I use 3M Strip Caulk (Black)  # 051135-08578.  Even in a opened box, it still stays soft and pliable


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

good morning everybody
 
looking for recommendations for replacement for M-5335-B.  " it is used at any joint where there is movement or rubbing between two metal surfaces"   originally asphalt /asbestos mix.  there's a multitude of sealers out there some cheap some pricy some twin pack some single component.
Thanks
stuey