I notice that sikaflex is made for yachts, marine use, etc. Well, being from plymouth there are sh!t loads of marine stores where I live, so I can just go buy it from the store. Guy on ebay is based in Plymouth, so i'll pick it up from him.
cheers for the advice.
LL

btw - i guess it was sikaflex that was already on the spoiler? It had some string running through it and was a black gooey, elastic material, that is a b***ard to get off!