Thanks for that Steve I used to use the DUm Dum mentioned on teh link you sent and was impressed with it> Did you use it with a rubber extrusion or instead of one? I guess a combination of the putty and taking the flex out of the scuttle would have it sorted for definite.
Regards

Hi ive used it on a few jobs twice under windscreens with total success, car builder solutions do one as well its a bytal product which is better as you can roll it out smaller.

Presumably as uopu roll it thin you use it under a rubber extrusion to cope with the flexing that Jeremy mentioned. I'll check out this other product. Thanks again.
Regards