Graham,
Try Innotec at
http://www.innotecworld.com/
The adhesive is called Adseal. I know people have used it, but not me yet, as I have just finished my last cartridge of Sixaflex. I can say the stuff I have used from them is pretty good so far, I've used the Flexi Coat stuff for stone chipping, sound prtoection on the panels in the front.
Brett